1980 Schuler Super Ranger 1980 Range Rover Schuler FF 1981 FF Service & Maintenance
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(from Schuler Presses info letter Jan. 1981):
The Schuler organisation is perhaps best known in the Motor industry for its high technology metal-
forming presses. Over the firm's 140 year (in 1980) history a policy of rigorous design, development
and quality control has been the cornerstone of its continued success.
These qualities are fully evident in the Schuler transmissions. Having produced an advanced and
sophisticated design, we embarked on a development programme that included some of the toughest
rallying events in the world. Success came quickly and the Schuler equipped cars continue to
dominate the off-road competition scene. To back up the high milage testing at home and abroad
the Automatic FF conversion has been submitted for full engineering and test evaluation by Land
Rover Limited. It is now their approvedautomatic fitment and therefor does not invalidate the new
Production units have been available since 1979 and quality control is assured by using the most
efficient and up to date machinery in purpose designed transmission plant. Every unit is put through
a 20 minute test cycle on a specially designed test rig that includes noise level evaluation over the
full spectrum of operation.
When finally installed in the vehicle there is a further half hour road test session backed up by a
34 point check list and written report before release to the customer. We believe that attention to
detail is the to superior service.
choice of either automatic or 5-speed manual gearshifts. Secondly, and equally important is the
entirely new transfer gearbox which by means of its advanced design transforms the driving charac-
teristics of the Range Rover. The standard vehicle transmission is returned as a complete saleable
item following conversion.
For those seeking a smooth, refined vehicle the automatic is ideal and has proved most effective
for towing and cross country use. The ability to feed in power smoothly is of great benefit when
starting on slippery surfaces and full manual override is available when required.
A Chrysler A727 Torqueflite automatic is used (as in current Aston Martin and Bristol models). It
has an unparalleled reputation for smoothness and reliability.
For manual gearbox enthusiasts an uprated Leyland 77 mm 5-speed is used. Its combination of
fast, slick change and ideally spaced gear ratios make it a delight to use. The high 5th gear allows
impressive fuel savings.
With the special Schuler transfer gearbox, high and low ranges remain but the conventional diff lock
is replaced by a viscous limited slip centre differential which automatically apportions the tractive
effort according to surface conditions. It is smooth enough to avoid breaking traction in marginal
conditions yet strong enough to allow the car to be driven with either propshaft removed in an emer-
gency. Unlike a conventional diff lock it neither degrades steering control nor allows wind-up and
shock loads over rough ground. Under braking it works so as to prevent uneven wheel lock-up
allowing a simple yet effective anti-lock braking system to be fitted as an option.
Higher overall gearing is standard allowing reduced engine revs at cruising speeds with resultant
savings in noise, engine wear and fuel. A unique 37/63% torque split front to rear gives better
traction when towing and accelerating whilst improving handling and vehicle control on corners to a
remarkable degree. Most important of all, transmission noise and backlash are eliminated at a stroke.
In combination, the automatic or 5-speed with the Schuler transfer box completely transforms the
vehicle. Many of our customers have told us that they now rate their Range Rover so highly they
simply won't drive anything else. Praise indeed!
Schuler FF transmission conversion summary of benefits:
Higher Overall Gearing - up to 17% with automatic, up to 40% with 5-speed. Less noise, less wear,
Economy - 5% better with automatic. 15% better with manual, due to reduced power losses in transfer
box, advantageous overall gearing and reduced weight.
Handling - 37% front/63% rear power bias from special centre diff improves both response and stability
to give an unrivalled level of safety and control.
Traction - Automatic limited slip differential prevents wheelspin while viscous action cushions shock
loads to protect driveline from damage.
Reduced Noise - Silent transmission and reduced engine revs drastically reduce interior noise levels.
Backlash - Special Morse-Chain drive system is free of snatch due to tolerance build up.
Braking - Viscous centre differential prevents instability due to eneven wheel lock up. Optional Anti
Skid system gives freedom from control loss due to locked wheels. Optimum deceleration is available
and the driver is free to steer the vehicle to safety.
Reliability - From the outset, Schuler FF transmissions were stessed for engines of considerably more
than 3.5 litres. Generous margins of safety are allied to the reliability reaped from our 4 year develop-
ment programme to give a product that will give many years of superior and uniquely enjoyable service.
A 12 month unlimited milage warranty is provided on all conversions.
Range Rover Conversion Pricelist 12/80
Transmission and Braking Modifications
All transmissions feature the Ferguson split-torque system, with limited slip centre differential and
high and low ranges of gears.
New vehicles only:
Chrysler Torqueflight A727 automatic transmission with Schuler FF Transfer Box, £ 1,999.00
excluding fitting, exchange - delivery milage only.
Fitting the above to standard r.h. drive vehicles £ 380.00
Chrysler Torqueflight A727 automatic transmission with Schuler FF Transfer Box, £ 2,395.00
Fitting the above to standard r.h. drive vehicles £ 380.00
The above prices apply to standard engines only, modified or altered engines at
With more than 15 years experience of tuning the Rover V-8 engine, Schuler can call upon a wealth
of accumulated knowledge. In addition to our many road engines we are also called upon to prepare race and rally engines for our friends in competition circles. As we carry on the continual quest for power our close involvement with the major manufacturers ensures that our engineers are well versed
in the latest theories of thermodynamics and energy conservation. This means that you the customer obtain true value for money. More power, more economy, more reliability and the peace of mind that comes only with Schuler quality control.
The key concepts behind the development of the 350 H.E. engine are higher thermodynamic efficiency and reduced parasitic power loss. It would have been easy enough to 'tune' the engine by merely shifting the clever compromise that the manufacturer strikes in development. Indeed there are many
conversions available today both turbocharged and normally aspirated which do just this. They increase
middle and lower end of the scale. They are powerful within their narrow rev range but impotent and
irritating elsewhere since they require a constant effort on behalf of the driver to maintain performance.
This effort ultimately becomes unwelcome and unsatisfying.
The Schuler 350 is different, indeed unique in that it offers you more power than standard even at its
smooth, rock-steady idling speed. At its 5,250 r.p.m. power peak (well within the engines designed
rev-range) it delivers over 30% more power than the standard high compression Range Rover. The
result is rapid overtaking and forceful towing performance. More torque makes cross-country driving a
real pleasure too, backed up by water proofing, dust proofing and idle stability on slopes that match
the original factory specification. This unique Schuler advantage will be very comforting should you
choose to test your Range Rover's ultimate off-road capabilities. Servicing is arranged so as to require
no special parts or skills worldwide.
Such a remarkable transformation has been achieved by a balanced package of improvements
developed in carefully conducted research programme. As back up to hours of dynamometer testing
in the laboratory many thousands of miles of road and competition usage were completed before the
350 H.E. was given approval for production. Its record since has been characterised by astonishing
reliability and longevity in the harshest conditions.
On arrival at Schuler's works every vehicle is first road-tested and its general performance, running
temperatures and pressures noted. The engine and underbonnet area are then cleaned prior to
The 350 H.E. engine then takes shape as it is carefully rebuilt to include (dependent on original
vehicle specification) a raised compression ratio, high-lift short duration camshaft, modified
carburettors and improved ignition advance characteristics. Parasitic losses are reduced by free flow
exhaust manifolds with large bore front pipes, replacement of the engine driven fan by twin thermostatic
electric units and removal of excessive emission equipment. The result is not only more performance
but a smoother, sweeter and quieter power unit. For added peace of mind the 350 H.E. carries a
12 month unlimited mileage warranty.
570T Engine Conversion
Distinguished by its special grille and side extractor panels, the Schuler 570 T Conversion offers the
Range Rover owner an exciting introduction to the world of effortless high performance. 5.7 litres of compact, lightweight GM V-8 power coupled to the GM 400 automatic gearbox (as used by Rolls-Royce and Ferrari) and Schuler's silent T2 transfer gearbox provide a truly delightful and unique motoring experience. Following the latest trends in engine development Schuler have designed a special "torque optimised" engine which offers tremendous benefits in terms of acceleration,
refinement and fuel consumption.
The engine performance graph above eloquently outlines the full story. For example, should you put your foot down with the engine ticking over at a mere 700 r.p.m. there is instantly more torque available than the standard 3.5 engine can muster at its 2,500 r.p.m. peak and by the time you reach 1,800 r.p.m. the figure is 50% greater still. By using a four barrel carburettor with small primary chokes this
tremendous punch is available on very light throttle openings without fuss or noise. This allows
uncommonly high gearing on manual cars and a specially programmed shift sequence on automatic
models that contributes to an outstanding level of fuel efficiency.
GM's responsive 400 series automatic gearbox (please check for our latest manual gearbox options)
manages all this power with superb smoothness and with strength in reserve. Power then passes through to Schuler's advanced T2 transfer gearbox which has been developed to suit engines of up to 350 b.h.p. and combines smooth, silent power delivery with the legendary FF drive system allowing this extra power to be safely delivered to the road even in poor conditions. By biasing power toward the rear wheels, traction and handling are transformed. Combined with our unique viscous limited-slip centre differential you gain a marked advantage in difficult cross-country conditions. Schuler's advanced system also makes possible the fitting of an electronically controlled anti-skid braking system as an option. By using the best available components combined with advanced technological solutions the 570 T emerges as a uniquely satisfying vehicle capable of performing almost any motoring task with distinction. Extensive testing and development in arduous conditions world-wide has ensured standards of serviceability, reliability and build quality that are fast becoming a legend. This leaves you free to relax and enjoy this car's smooth, silent and immensely powerful performance.
Schuler Transmission Conversion
The Schuler Transmission Conversion has already earned a worldwide reputation among enthusiasts
for strength, silence and smoothness. Its advanced design has full engineering approval from Land
Rover Limited and quality control is assured by using the most modern efficient machinery in a purpose designed transmission plant. Every unit is put through a twenty minute test cycle that includes noise level evaluation over the full spectrum of operation. When finally installed in the
vehicle there is a further half hour road test session backed up by a thirty-four point check list and report before release to the customer. We believe that attention to detail is the key to superior service.
By incorporating the sophisticated Ferguson Formula drive system Schuler offer a performance as
far ahead of normal four wheel drive as this is in turn superior to two wheel drive. Even in normal motoring the engine's torque is split unequally between front and rear axles in the ratio of 37% front/63% rear. This avoids traction problems due to weight transfer under acceleration or when
towing and guarantees a standard of safety and control that is not available with any other drive configuration. It removes the tendency of front drive or conventional four wheel drive cars to lose steering control when accelerating through a slippery bend whilst avoiding the equally dangerous situation on rear driven cars where the rear tyres lose adhesion and ultimately cause the vehicle
to spin out of control.
For off-road use a 2.8:1 low range gear facility is provided and the awkward conventional centre differential lock is replaced by a more effective viscous limited-slip device which automatically apportions the tractive effort according to surface conditions. It operates smoothly enough to
avoid breaking traction in marginal conditions yet allows the car to be driven with either propshaft removed in an emergency. Unlike a conventional differential lock it neither degrades steering
control nor allows damaging wind-up and shock loads over rough ground. Under braking it works
so as to prevent uneven wheel lock-up allowing a simple yet effective anti-lock braking system to
be fitted as an option.
By separating the four wheel drive and main gearbox functions almost any primary gearbox may be
installed. On 3.5 litre cars the legendary Chrysler Torqueflite A727 Automatic is standard (as in
current Aston Martins and Bristols). This has an unparalleled reputation for smoothness and reliability.
For manual gearbox enthusiasts an uprated version of the Leyland 77mm 5-speed offers a swift and
precise shift combined with ideally spaced gear ratios. The high 5th gear allows impressive fuel
For really heavy use, such as in diesel or larger engined Range Rovers a competition version of
the Schuler Transfer gearbox (T2) is available with a choice of gear ratios. Despite its massive
torque rating (up to 350 lb/ft) it offers the same extraordinary silence, smoothness and freedom
from backlash as the standard unit.
By offering tomorrows technology today, Schuler have created a transmission system that will
make your converted Range Rover uniquely capable and fun to drive.
In keeping with our policy of making tomorrow's technology available today, Schuler have been
selling Range Rovers with Anti-skid Braking for longer than any of the major manufacturers. Unlike
rival systems on current saloon cars which were simply added to existing transmission designs, the
electronically controlled Schuler system was included at the design stage into our four wheel drive
transmission system. The essential sensing components are built into every Schuler transmission we
fit so that the anti-skid system can always be included at a later stage should you require. Anti-skid
cannot be fitted to a standard Range Rover transmission because it lacks the unique viscous control
unit which closely controls individual wheel speeds and allows the skid control function to be
performed by a single sensor which is safely protected from harsh cross-country environments by
its positioning within the 4-wheel drive gearbox.
Simplicity and reliability are key elements of the Schuler anti-skid system. It retains traditional vacuum servo actuation and hence requires no special servicing skills. It can be even tested using
the most basic equipment available worldwide. The electronic control module which triggers the
system in one 100th of a second is housed inside the passenger compartment to protect it from
outside conditions while the system as a whole is fail safe, cutting out should a malfunction occur.
A noticeable increase in brake pedal load then warns the driver that the system is in the fail-safe
mode and should be driven to a workshop for inspection and repair.
In normal driving you will be pleasantly reminded of your Schuler electronic anti-skid by the much
lighter pedal pressures and tremendous bite afforded by the larger brake servo which is fitted as
that this power is backed up by electronic skid control when you need it, driving in difficult
conditions need hold no fears.
Should an emergency situation become reality the Anti-skid system delivers a remarkable
performance. Stopping distances are reduced by up to 33% and even more importantly the Schuler
system retains steering control while cornering to allow emergency braking at up to 90% of the
vehicle's breakaway speed. Inevitably some emergency stops will involve the vehicle straddling
surfaces where one side is more slippery than the other. A vehicle with normal braking will almost
certainly spin uncontrollably in these conditions. The Anti-skid system takes this problem in its stride
stopping the vehicle in a straight line under full steering control. Whatever the speed or surface
Schuler Anti-skid can utilize the maximum grip potential of the tyre/road surface to help keep you
out of danger.
Technically, the system works by electronically sensing imminent wheel lock and modulating brake
line pressure within fractions of a second to maintain maximum retardation. Dependent on the road
surface the electronic module selects the optimum cycling rate. This varies between two and six
times per second. A mild pulsation of the brake pedal informs you that the system is operating and
serves as a warning of treacherous road conditions. The system is both faster and more accurate
than the expert driver can hope to achieve. Remember, Anti-skid only needs to have worked once
in the life of your car to have paid for itself many times over.
In the diagram on the right we show the results of actual comparative tests between a standard
Range Rover and Schuler's Anti-Skid equipped Range Rover stopping on wet asphalt from 50 mph.
A saving in stopping distance of 65 ft shows the enormous extra margins of safety that anti-skid can
The Range Rover is universally acknowledged as the king of off-road vehicles. Its success comes from offering tremendous strength and cross-country capabilities without the usual sacrifices in terms of on-road comfort, performance and handling. In short it is a tough 4x4 when required and a respected prestige car at other times.
Schuler have now taken this concept a stage further. The first step is the introduction of the Schuler FF transfer gearbox. Not only does this offer greater strength, silence and traction but it offers gains in handling which have to be experienced to be believed. At last the stability and safety of front wheel drive has been combined with the response and control of rear wheel drive. The result according to Stuart Marshall, Motoring correspondent of the Shooting Times is "a cross between 4x4 and a Ferrari".
Once equipped with the Schuler FF transmission your vehicle is well placed to benefit from Schulers choice of chassis modifications. As is our policy we use advanced technology and the best materials to avoid the usual compromises. Should you require the best in off-road capability we offer a modified suspension which includes additional high performance rear shock absorbers to provide better axle control.
and prevent fade. Modified bump stops arrest suspension travel more progressively to give a more comfortable ride and help prevent the possibility of chassis and axle damage due to shock in extreme conditions. To improve traction we can fit a progressive gear-type limited slip differential to the rear axle which avoids the embarassing situation where the car is stuck fast with two wheels spinning uselessly. This unit is not harmed by manoeuvring on tarmac and needs no periodic adjustments. To complement this extra traction we offer special aggressive treaded Mud and Snow radial tyres. Specially designed with a tread only a little wider than the standard tyre they exert a high initial ground pressure to give superb traction on firm surfaces. On soft ground once they sink past the depth of the tread, flotation is provided by a wide 9.5" sidewall section to help prevent the vehicle sinking and bogging down. Thus the advantages of both narrow and wide tyres are combined. A 15" alloy rim is fitted to keep unsprung weight within design limits but the slightly larger overall diameter still gives an 8% improvement in axle ground clearance. On the road, grip and handling at least match those of the best standard tyres and the speed rating is a full 100 m.p.h. In short we offer cross-country perfection without losing any of the Range Rovers traditional virtues.
To further uprate the Range Rover's tarmac performance without losing cross-country ability presents more complex problems. Normal expedients such as stiffer springs, conventional anti-roll bars and firmer dampers merely prevent axle movement and destroy off-road performance. As a starting point the Schuler FF transmission is however naturally ideal, giving superb handling with superior traction.
Having banished the handling and traction limitations of conventional 4-wheel drive your vehicle is then well placed to benefit from Schulers unique suspension system. This uses advanced air strut technology to combat roll and improve axle location. Extra roll stiffness is provided at the rear by removing the single standard central levelling device and installing twin air struts mounted outboard of re-rated springs to provide maximum resistance to roll.
Modifications are made to the rear suspension bushing to reduce compliance steer and in addition twin adjustable shock absorbers specially made to Schuler's specification control fore and aft movement of the axle on bumpy surfaces to give vastly improved stability. An onboard air compressor controlled from a dashboard mounted monitor allows you to alter the rear ride height at will. Best of all cross-country traction is unimpaired since a reduction in air pressure allows full axle twist to be achieved over uneven ground. An air line is provided with the vehicle to allow tyre pressures to be checked and adjusted using the vehicles compressor without outside assistance. To complement the new suspension design, special low profile 235 section tyres can be added to provide startling grip, superb straight line stability, silent running and a continuous speed rating of up to 130 m.p.h. Fitted on lightweight 7x15" rims they give a wider track for improved stability and their tread pattern retains strong off-road performance.
As well as relaxed, effortless towing and superb cross-country performance the Schuler Range Rover with these options, offers an on-road performance that makes a mockery of more conventional opposition.
In the photograph below the Schuler Range Rover features anti-roll suspension, low profile tyres and the Schuler FF transmission. It is seen in a comparison test at Schulers test track against a successful high performance saloon, the Golf GTI. On the same radius bend at the same speed the Golf is about to run out of road and rolling severely. The Schuler Range Rover is level, poised and has a great deal more to deliver as can be seen by this comparison table of maximum cornering force.
To achieve these stunning results Schuler have not sacrificed ride comfort since the extra stiffness is only noticeable in roll. However those who carry heavy loads or tow large trailers will find that roll stiffness is increased automatically as the vehicle is levelled to provide an added degree of stability.
Schuler can also offer a unique design and development facility for specialist vehicles. The particular problems experienced with competition conditions, very high payloads or even six wheel drive can be examined scientifically at our extensive test facilities and resolved using advanced technology solutions backed up by controlled testing and development. Our involvement in racing and rallying has ensured that Schuler designs are continually tested in the very harshest of conditions.
To cope with any increased engine performance, Schuler have developed in addition to a remarkable anti-skid brake system, a ventilated front disc brake system for the Range Rover. Based on racing practice the large 11.97 x 1.25" vented discs also feature radial slotting to dispel water and continually clean the pad surfaces. Special high temperature pad material is used to give stable braking from high speed and further reduce the possibility of fade. The result is a firm progressive pedal feel linked to powerful, sustained bite from high speed. Pad life in hard use is very much improved. A four piston brake calliper assembly is retained to give unusually good stopping power on either of the two separate brake circuits. In short whatever the level of performance your Range Rover provides, Schuler have the chassis technology to match it.
1975 - Under the umbrella of Schuler Ltd, the UK arm of the German international automotive supplier
- Schuler Presses GmbH, the performance Range Rover is born. Development commences to
improve Range Rover performance using 4 Dellorto carburettors and other external modifications.
1976 - Experiments with 4.4 litre Leyland P76 V8, the Australian version of Rover V8 with heavy duty
block from the Australian saloon P76, in a Range Rover.
1978 - Prototype testing of new Schuler/Ferguson Formula transfer gearbox and Anti-Skid Brake System in the Welsh Rally.
1979 - Pioneering development of the 5 speed manual and 3 speed automatic transmissions with
Land Rover's involvement and co-operation.
1980 - Release of Schuler 350 SE. Similar power and torque to latter day 3.5 EFI, but used the
existing Stromberg carburettors. Land Rover Ltd commissioned Schuler to produce 25 Range Rovers
with Schuler/FF chain drive transfer case and Chrysler Torqueflite automatic for sale through dealers
to test market acceptance of automatic Range Rover.
This led to it becoming a factory approved option retro-fitted by Schuler Ltd.
1981 - Paris-Dakar Rally won a Range Rover entered by Land Rover France equipped with the
Schuler/FF gearbox and using components developed in conjunction with Schuler won this famously
gruelling event in face of strong competition.
Schuler built a Jaguar V12 engined LWB Range Rover development mule, introducing the concept of
the performance Range Rover. High speed testing chassis gives unique insight into the vehicle
behavior. First appearance of Vented Brake option and second generation transfer gearbox for engines
up to 350 HP.
Australian developed Range Rover Schuler FFRR 5000, built from CKD local assembled Range Rover, imported Schuler Ferguson Formula parts and usage of V8 5.0 ltr Brock HDT or V8 4.4 ltr
5 speed with Rover SD1 gearbox and Ferguson transfer unit
1982 - STRANGE ROVER, project. In conjunction with a rally spcialist, the world's first mid-engined
Introduction of first Chevrolet engined production vehicles. The 570 T (Torque) with GM400 automatic
gearbox combined performance, refinement and longevity.
1983 - Further research and development to refine and evolve the GM Chevrolet 5.7 litre engines.
1984 - Introduction of Touring fuel tank and Air Strut suspension option.
1985 - Schuler hand over control of the Range Rover division to their UK Managing Director, who
changed the name to Overfinch.
Official acclaim of 570 T model by Motoring Press.
1986 - Introduction of Overfinch 570 S (Sport) with GM700 4 speed automatic transmission and
lock-up torque convertor.
Armoured Range Rover project - Ministry of Defence comissioned Overfinch to carry out specialist
conversions to 5 armoured examples to improve handling and stability levels on these heavy vehicles.
1987 - More comprehensive package of enhancements on the 570 S to include braking system
and long range fuel tank. Ferguson Viscous Control unit with 2/3 rear, 1/3 front distribution
1988 - Launch of Overfinch 500 E and 500 S. Cost effective 5.0 litre models achieved by retaining
standard gearbox. Land Rover (570 E); a 110 Pick-upwere fitted with torque optimised 5.7 litre
engine, GM700 gearbox, Overfinch FF transfer gearbox and Overfinch suspension, outstanding
1989 - Launch of Overfinch 570 S2. Power increased, new ride and handling suspension system
plus further refinements.
1990 - Fuel injected Overfinch 500 I and 570 TPI models introduced. Advanced electronic injection
system offered improved economy, performance and driveability.
New Precision Steering conversion (PSC) enhanced chassis dynamics.
1991 - New Quick-Ratio Steering option revolutionized the Range Rover driving characteristics, with
standards of responsiveness and high speed security.
New Overfinch 570 TI (Torque Injection) announced. High value performance conversion achieved
by interfacing 5.7 litre power with uprated version of original ZF automatic transmission.
1993 - The limited edition 10th Anniversary 500 I and 570 TI models celebrated 10 years of GM
engined Range Rover production.
New Ride and Handling suspension package announced for air sprung Classic Range Rovers.
New high value 570 CI model launched superseeding the previous 5.0 litre models.
1994 - Exclusive Overfinch Recaro Sports Seat option - after over 2 years development, properly
integrated Recaro seats, incorporating unique Overfinch design requirements.
High Performance Diesel (HPD) engine uprate release for all TDI powered vehicles.
Exclusive Overfinch Nevada 8x16 two piece alloy wheels launched.
1995 - New Sport Design range for all Discovery and Classic Range Rover offered a choise of
4 high value enhancement packages.