4wd front tyres were definately better on the maxxum when i had it, although they were on the narrow front wheels, not the rears as you ran them. they gave more consistent steering and more traction, i would say it is probably the more weight on a smaller area helping them to bite in better. if you do try a geared diff, dont go too heavy on the oil it may help with traction but will take away quite a bit of the off power steering, tried mugen diff grease which was like treacle in the maxxum and it was awful. much better with standard lm grease
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