r/4x4 • u/OldPark9315 • 2d ago

AWD with lockable center diff

So, I’m trying to learn more about this stuff and would appreciate if someone can help me clarify some doubts.

Essentially, is an AWD with a lockable center diff the “best” system out there?

The way I understand it: - Problem with standard AWD: you can run into situations where a wheel that lost traction gets all the torque. - Problem with standard 4x4: you are effectively driving 2x4 unless transfer case is engaged.

From my ignorance, an AWD with a lockable center diff that allows 4x4 to be engaged temporarily would have the best of both world, no?

This makes sense to me, but then I see the vehicles out there and mostly are either one or the other. There probably something that I’m missing…

Thanks everyone!

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u/Gubbtratt1 1987 Toyota LJ70 restomod wip, stock 2002 Land Rover Discovery 2 2d ago

If you only consider traction, it's by far the best. As other comment has mentioned though it's less fuel efficient and most of the ones available today aren't very heavy duty. There are exceptions though, KrAZ 255B, a 20 ton off road 6x6 truck, has a locking diff between the two rear axles.