Sounds like possably a problem in the vavle body of trans...If I remember right it had a 440 trans in it and they have been a problem since they were built ..........be sure to check trans fluid first
bg, December 2005
It could have the wrong transmission fluid in it.
Terry, December 2005
edit
I can answer this question...
how can I fix my transmission in my 1998 chevy lumina?