Originally Posted by PolkaPower
They don't have aux transmission coolers and they often overheat without them. This was a big mistake for 98 ZJ's.
You could try to find the gov pressure sensor and solenoid out of a JY ZJ and see if replacing those works but if you are not having a check engine light then it may not be the issue.
As a last resort I would try a couple bottles of some additive like maybe Lubeguard Red. Other than that you will probably need a re build but that will give the the chance to put a shift kit in and make it better.
A friend, who re builds his own ford trans, is supposed to help me re build it. If I didn't have to I wasn't going to though. What's a shift kit do for it?