Part Time 4WD Conversion

PART TIME 4WD CONVERSION

Constant Four-Wheel-Drive?
Given that many 4WD vehicles rarely travel off the bitumen, constant 4WD not only hinders performance it also makes your vehicle guzzle much more fuel.

How Part-Time 4WD works
Within the transfer case, there is a third differential which compensates for the different distances travelled by the front and rear wheels. This differential also creates most of the drive line back lash with which these vehicles suffer. The back lash also makes them quite difficult to drive smoothly.
This differential sphere is what we replace with a locally manufactured component, which drives the rear output shaft.
The mechanism in the transfer case which has been used to lock the centre diff remains unchanged but now is used for engaging 4WD The controls inside the car remain the same. The Centre diff lock button becomes the high range 4WD button.
If you refer to your 80 Series Owners' Manual - the section on operation of instruments and controls - "Four wheel drive control (lever/button type)" - you can see a full run down on how the system works.

The Benefits
The modification simplifies the mechanical drive train of the vehicle. Nine small moving parts are replaced with one large machined billet of induction hardened high grade steel, which takes over the job of all the removed parts.
Hence the transfer case is far stronger and more reliable. Improved fuel economy, steering response and tyre wear as well as smoother clutch operation due to the removal of the transmission back lash, improved highway cruising and the lowering of noise and vibration transmitted to the passenger compartment are consistent with the modification.
Our in-house testing and feed back from our customers (see below) indicates on average, there is a 10% fuel saving.

Dyno Dynamics Chassis Dynamometer Part Time Four Wheel Drive Test
Speed Kph	Tractive N	Power Kw	Four Wheels Driving Before Part Time Four Wheel Drive Was Installed.
40	2734	31.5
60	3396	56.3
80	3042	67.8
100	2844	79.5
120	2213	73.0

40	3106	34.6	After Installation with Rear Wheels Only Driving.
60	3553	59.7
80	3207	72.3
100	2997	84.3
120	2412	80.5

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