Originally Posted by SnoFire
There are 2 different models of the 8 speed, 1 for the 3.6L and the other for 3.0/SRT. The SRT seemed to be better in the beginning with less issues. The 9 speed has been talked about for over a yr now for the Cherokee.
The 3.6L has the 845RFE 8-speed transmission which is a Chrysler-modified ZF 8HP45 produced by Chrysler under license.
The 5.7L, 6.4L, and 3.0L diesel have the ZF 8HP70 8-speed transmission built by ZF.
The 9-speed is also a ZF design but is an entirely different setup designed for transverse-mount (Front-wheel drive) arrangements.