Motoring Discussion > Tyres question Miscellaneous
Thread Author: Bobby Replies: 70
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New Tue 1 Dec 20 10:34 
 Tyres question - Terry
I seem to recall that in the good old days a proper 4x4 ideally needed three differentials - one on the back axle, one on the front, and one in the centre to split the drive between front and rear.

With the full set up each differential could be locked separately so that in very severe conditions you could direct the drive to the wheel with most grip, rather than that which most easily slipped. On Series Land Rovers I believe each of the front wheels could be locked separately!

If you locked the diff, the advice was usually to limit your speed as thhis would stress the drivetrain through different wheel circumference or even turning a corner.

This was a complex solution for most needs other than operations in very severe terrain. So predictably manufacturers cut out some of the complexity by eliminating the centre diff, and the ability to lock them. Some functionality was replaced by the use of limited slip differentials.

We now have lots of clever electronic systems and controls which means that 4x4 means different things on different vehicles - save the fact that the capacity provides the ability for all four wheel to be driven some of the time.

Best solution is probably to follow the owners manual or manufacturers guidance - if for no other reason than preserving the possibility of warranty support in the event of a claim.
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