Mr.FRU-T-Pants

The rear diff only needs to be changed out, right, to match the center ratio? Why wouldn't the front need replacement as well? Am I just not thinking? The physics logic has me a bit stymied...can someone straighten me out?

Thanks,
Fru-T

snoogins

The front diff is contained in the tranny, so the rear is the only one that would need swapping.

Mr.FRU-T-Pants

For some reason, I was thinking that there was a rear, a center, and a front in the type 85's.
Thanks for the clarification.

Fruit

gmbchef

The front one is contained it the trans, as snoogins said. The center diff is bolted onto the rear of the transmission, and, well, obviously the rear is in the rear.
HTH

Mr.FRU-T-Pants

Like most other later models... I'm on track now.

Gracias,
Fruitman

urq20vt

There are two final drive ring and pinion sets, one in the transmission for the front axle and one rear diff for the rear. These must match. The center differential has nothing to do with the final drive ratio.

If you want to switch to say 4:11 final drives, you need to either have the front ring and pinion changed, which is difficult or just swap the transmission. Then you need the 4:11 rear diff to match.

Mr.FRU-T-Pants

I guess that's true, since the center diff just distributes bias of power front/rear...