transmission interchange

[kaotikd]

I have a 2000 ssei with bad trans. Will a 1997 grand prix gtp trans work in my ssei?

[sandrock]

Short answer is no.

Long answer is yes, BUT IIRC there was an electronics update somewhere around 2000, as well as a hardware update. I'm still not up to speed on the 4t65 yet, and I am sure someone that is will better steer you, but my gut tells me it won't quite work.

[agrazela]

Without swapping any internal parts, the only transmissions that are a direct drop-in replacement for a 2000 SSEi are:

2000-2002 Pontiac Bonneville SSEi
1999-2002 Buick Park Avenue Ultra (though the Torque Converter is different)

No Grand Prix GTP (or other W-body) trans will be a drop-in, because they are not Internal Mode Switch (like 2000+ H-Body)

[kaotikd]

Ok thanks for all the input.

[2001SSEi]

I am looking for a spare transmission and I found a 2003 SSEi transmission with low miles, What do need to changed or update or make this work in a 2001 SSEi?

Internal changes or differances? I know it has a updated 4th output shaft.

I also know it may require the 2003 control module, is this different than the PCM or is it part of the PCM/ECM?

[00Beast]

I believe the difference in the PCM is all about the trans, although I could be wrong. I know an 03 trans won't work with an older PCM, idk about a newer PCM and trans in an older car.