I just installed a rebuilt Transmission Computer Module (made by a reknown rebuilder, with 4 moth warranty).
But the transmission still isn't working on my '93 Dodge Caravan.
Before I had it rebuilt, the car wouldn't shift from 2nd into 3rd gear but go into neutral and then stay in safe mode (2nd gear).
After I installed the rebuilt TCM, it reacts exactly the same way.
When I got back to this guy he said that the solenoid pack is most probably clogged and suggested I got a new one, but I already switched it ones, about a year ago and it behaved exactly the same way than it does now.
Any idea what else might be the problem? Perhaps a bad input or output speed sensor, or some of the contacts on the TCM connector?
This is a classic example of throwing parts at a problem without proper diagnosis.
What you can do is remove the plug on the OD port as I explained in your earlier post. install a pressure gauge, even a cheapie oil pressure gauge will work. run the vehicle when it shifts to 3rd, you will see over 80psi pressure when the solenoid activates.
If it does, then your problem is an internal failure. Most commonly a broke overdrive hub.