FAQ - Marks4WD Part Time 4WD Kit

Marks 4WD manufactured heavy-duty part-time 4WD conversion kits fits all 80, 100 & 105 series LandCruisers factory fitted with constant (full time) 4WD.


The centre diff becomes completely inoperative as the spider gears & the rear side gear is completely removed. The rear spool supplied in the kit is manufactured from heat-treated gear steel & internally splined to allow the permanent drive to the rear wheels. The front side gear is retained, as it is required to support the front output shaft in the main housing. The kit is supplied with free wheeling hubs & are fitted to prevent the front diff, axles & drive shaft from turning while the vehicle is being driven.
There are several benefits to consider when converting your LandCruiser 80 or 100 series to Part time 4WD. The steering no longer has a tendency to pull hard when powering out of a corner which adds to less wear & tear on the steering components such as tie rod ends & steering box. The steering also becomes more direct or positive. There is a marked improvement in fuel economy an average of 5%-10%. The acceleration is also improved due to the reduction in losses associated with driving the front differential, drive shaft & CV joints. With these components no longer being driven, a considerable increase in their service life can be expected.

Some 80 Series LandCruiser’s are fitted with longer splined CV shafts. The spacers are used to correct the end float.

A vehicle fitted with a viscous coupling does not have a centre diff lock button on the dash.

The viscous coupling is no longer required & removed from the transfer case during installation of the Part Time 4WD kit

High 4WD – Lock in the Free Wheeling Hubs & push the Centre Diff Lock button
Low 4WD – Lock in the Free Wheeling Hubs & engage Low4 with the gear lever (the Centre Diff Lock button can be depressed or not – the transfer case will lock as soon as the lever is moved)

No, this will cause wind up of the driveline and could cause the possible failure of the transfer case, differentials or axles.

No – with free wheeling hubs engaged.
Yes – with free wheeling hubs disengaged. This can be useful when slowly maneuvering caravans, trailers etc.


A good mechanic can install the complete kit in around 4 hours.

Yes. The kit is supplied with full fitting instructions.

Yes, a bearing press is used to remove and install the bearing on the diff spool, however, we also offer the option to have a brand new OEM spec Koyo bearing pre-pressed onto the new spool.

No problem, your local mechanic will be more than qualified to fit the kit.

No. When the Free Wheeling Hubs are disengaged and no spool in the transfer case – all the power will be directed to the front axle and the vehicle will not move.


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