Transmission

Five-speed, manual gearbox, with synchromesh on all forward gears in transaxie at front of car, separate from engine. Clutch and transfer gears in unit with engine. Cars are delivered with the transmission fixed in four-wheel-drive, but after a simple modification, to be made by the driver, there is a choice of four-wheel- drive, or rear-wheel-drive only, by driver control of lever on transmission tunnel, in passenger cabin. Front, centre and rear differentials. Lockable centre differential. Exposed drive shafts to all driven wheels.

Clutch and Transfer Gears

Mounted at front of engine. Twin-plate, diaphragm spring clutch, with 7.25 in/18.4 cm diameter friction discs, and hydraulic actuation. Quick change, helical spur, primary drive transfer gears, ratio 1.043:1.

Gearbox

Five-speed and reverse, synchromesh on all forward gears, mounted in same casing as centre differential,
rear-drive/four-wheel-drive control, and front differential. Centrally positioned, remote control, gear
change lever, on transmission tunnel, between passenger seats.

Gear Ratios

Gear

Ratio

Overall
ratio including
transfer
gear

Overall
ratio to
wheels

Transfer
First
Second
Third
Fourth
Fifth
Reverse
Final drive

1.043
2.692
1.824
1.318
1.043
0.786
3.083
4.375

2.809
1.903
1.375
1.088
0.820
3.216

12.289
8.326
6.016
4.760
3.587
14.070

Drive to Wheels

From front of gearbox to cuff-joint selector controlling drive to front wheels. In rear-wheel-drive mode, full engine torque passes to the rear differential only. In four-wheel-drive mode, torque passes to central torque splitting differential, with outputs to the front differential (between front drive shafts), and by propeller shaft to the rear differential (mounted behind the engine).
Two propeller shafts. Primary shaft links clutch/transfer gear housing to main transaxle. Two-piece shaft links transaxle, to rear differential. Constant velocity joints throughout.
All differentials are Ferguson viscous-coupling type, with epicyclic gear trains and limited-slip mechanisms, by specially-shaped discs interlaced through silicone fluid in shear.
Cars are delivered with the transmission fixed in four-wheel-drive mode, with an unlocked centre differential.
Normal torque split is 37 per cent (front)/ 63 per cent (rear), in four-wheel-drive mode. On rally specification vehicles, centre differential may be locked by moving the two-wheel-drive/four-wheel-drive lever to an extra position. This provides direct mechanical connection between front and rear differentials, and a 50 per cent/50 per cent torque split. The lever may also be used to select RWD with all power going to the rear wheels.
Exposed, universally jointed, drive shafts to all four wheels.

ISSUE 1

RS200 SECTION 01-4