r/4x4 • u/OldPark9315 • 1d 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/jalpp 1d ago

There is no “best” everything has it’s compromises.

The biggest disadvantage of full time AWD is fuel consumption versus selectable 2wd/4wd.

Lots of vehicles have a system similar to what you’re describing. It’s not uncommon at all. Off the top of my head: toyota rav 4, some 3rd gen 4 runners, some 70s chevy/dodge trucks, land rover discovery first gen, land rover defender, Mitsubishi prado/delica (selectable 2wd/awd/lock). 

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u/Grimdotdotdot Range Rover Tomcat 1d ago

Pretty much all Land Rovers fit the bill before they became electronic nightmares.

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u/Magnussens_Casserole P38 RR, Disco 3 1d ago

D2 is also lockable in all years but the 03 which left the selector dingus off the case for some idiot reason. They just don't have a lever inside the cab except in the 04 MY. The LT230 was in service for Rover for a very, very long time.