M30 Trans seems like it is starting in 2nd?

[prts4days]

I have a 1990 m30 that sat for little while but drove and shifted fine before it sat now it doesn't shift quite right. I can manually shift it to first and then it seems better but if I just put in gear and go it feels like something is hanging up or holding it back. Any ideas? Also is this transmission a basic rebuild or is there any tricks to the assembly? Thanks

[chitownq45]

Can you let me know if you found out the problem.....I'm having the same problem...seems like when the car is cold the trans shifts fine....but once the car warms up I have the shifting problems as you do and also it seems as if my overdrive doesnt engage either. you can note me here or email me at [email protected]

[elwesso]

It seems as if maybe its in fail-safe. When taht happens it locks in 3rd gear.. I dont have an M30 service manual so I cant give you any procedure how to check the AT codes... Maybe someone else will chime in.