42re help

So just recently I've lost over drive in my jeep and I'm not sure what to look into first seeing how reverse has been hat feels like binding and bucking when I gave it gas. fluid was burnt when I bout the jeep due to lack of fluid I drained and refilled. also when in neutral It still creeps forward when I'm on a flat surface should I consider replacing the transmission or icicle it be some thing simple? it's a 95 with 300k on it sitting on 33s ide appreciate and help or feed back

You have an AW-4 automatic transmission. Use the Google, and find the AW-4 Service and Diagnostics Manual that has been posted on other forums. Perform the AW-4 function tests and follow the diagnostic charts.

Wait, is this an XJ or a ZJ?

XJ: AW4
ZJ: probably 42re like you said.