3.55 ring & pinion

I would poke around your local Dodge dealers and truck forums.

There are a lot of guys who yank the 3.55s out of their Dakotas and replace them with 3.92s or 4.10s. I bought my set for $40 with 20K miles on them from a V6 Dakota.

Jeep Liberties and V6 Daks use 8.25 axles. Beware though...don't buy the whole center chunk unless you want to use custom axles. '97-up 8.25s use 29 spline carriers vs. the older 27 spline in everything else.