I have a 1999 Olds Sillohuette w/ 73000 miles. I had to have the trans rebuilt at 51000 miles due to extremely hard shifting. Now it is doing it again, but seem to start occuring on longer trips(not around town) or after a sudden stop. Is my transmission computer controlled? It seems like I remember the first repairman said something about a torque convertor going bad.
Hello, I am RandallIs the hard shifting in each up shift gear. so.. everythime it shits it shifts real hard? or is the hard shift only when going into overdriver or another gear?
It shifts hard in all up gears when it starts happening (usually on longer trips after trans/motor are hot) It also occurs sometimes after a quick stop at a traffic light.
This is the third try to do this - maybe it will go through this time! It shifts hard on all up gears when it starts to happen
Have to bear with me, have to look up info and then type and send. sorry about thatIt sounds like a bad or failing PC vakve or pressure control valveIts located on the side of the trans valve body. Now.. yes, yours is 100% computer controlled but the PCm generally does not cause thisDuring a rebuild they do not change control valves or solenoids, only soft parts and hard parts and seals that are worn insideI am thinking the PC valve may be sticking at times and this will cause too high of fluid pressure and hard upshifts. Torque converter maybe? but usually not till you shift into overdriveAt this point its important to be sure trans fluid 100% full. You may want to consider adding a bottle of Lucas trans additive as may really help to free up the PC valveA full trans fluid flush may not be bad idea as wellTransmissions are complex, computer controlled so,, a scanner hooked up viewing live data is the only way to do diagnostics etc so I can only lean to what I feel the problem isthe PC valve requies the pan off, valve body out to change it. recommend a shop to do this if at all possible