1995 Eddie Bauer 5.0L 302 V8 trans 4R70W 3.55 non ls 170k mile, tranny has been rebuilt (prior owner) Getting error code 632 during KOER self test, and yes cycling the od button on and off with engine running....(the od on/off light functions so assume the switch is good..) symptoms are erratic downshifting/upshifting driving 40-50 mph (feels like truck shifting down to 3rd and back to 4th...rpms jump from say 1500 to 3000.. have researched here and there, suspecting throttle position sensor? and/or torque converter solenoid? Any help on where to begin?
Process of elimination. Does the engine stumble or run uneven in park when running it at the same speed you are having the transmission up, down shift trouble ? Looking for the bad point on the TPS reostat. (Variable Resistor). If not I would say the TPS is not the problem. It is the cheaper part, about $32 depending on where you buy it. Now since it is a shifting issue, more than likely it's the shifting solenoid. Just your luck it's the most expensive part I saw, but there are different solenoids in that 4R70W. Hope this helps. Sent from my SM-G930P using Tapatalk