Fulltime fwd

Generally speaking:

Fulltime or Constant 4WDs have a center differential which allow the front and rear tailshafts to spin at different rates (avoiding gearbox damage among other things). They usually have a center diff 'lock' to force the two tailshafts to spin at the same speeds (just like a (usually) chain-driven part-time 4WD).

Any vehicle requires the front wheels and rear wheels to spin at different rates otherwise you can quickly do damage to your vehicle. Usually when you use 4WD, the ?dirt roads provide enough slip for the wheels not to do as much damage as it would on hard grippy tarmac.

Dave.

Hi Paul
Full time 4WD is very simple, as you know the normal 4wd has a diff in the front and rear axle, the full time version has a extra diff fitted to the output side of the transfer box allowing the front and rear drives shafts to rotate at different speeds when cornering, this diff can be locked to provide constant drive when on loose surfaces.
Hope this helps
Ray

yeah just remember to never lock the centre diff on high grip surfaces, the same as running 4WD on a part time fourby.
Cheers, Mark.

Thank's for the info, the question was in relation to an 80 series cruiser. What is the preference amongst fwdriver's? Is it more costly for repairs?

Thank's again Paul...