1991 Nissan Pathfinder - RE4R01A

I used to drive a Nissan Sani DoubleCab 2x4 1996 model. Similar was experienced. Its got to do with the gear ratio.

If you have rebuilt the transmission and replaced the solenoids and are certain you did it right you should look elsewhere. Plenty of engine performance problems will cause erratic transmission operation. Electronic transmissions share some of the sensor signals with the engine ie TPS, ECT, VSS. You should check your electrical circuits as well in relation to the transmission sensors and actuators.

Yes , Ive checked TPS(even swapped it), the VSS & ECT were with in specs as to ohms and getting voltage. Do you know of a way to check TCM other than that from ALLDATA, and have you come across the TCM vise the ECM being more likely to fail?

Thanks for your in-put kool.

I would check related sensor data input at the TCM and verify TCM commands at the actuators. Test driving the vehicle with a DSO hooked up to the solenoid circuits would be a good idea as well. I don't know what alldata's procedures are but that I believe is the easiest way to diagnose a defective module.