Tranny stated acting really strange. At first it didn't not want to shift out of 1st at WOT. Then I went to drive to a friend's house a mile or 2 down the road and it wouldn't shift out of 1st at all. After a block or 2 it shifted fine. I pulled the shifter back to 2nd and it went in to 2nd. I then came to a red light and it was stuck in 1st again and wouldn't not shift out. It does not slip at all in any gear. The transmission was rebuilt about 30,000 miles ago. The fuild looks new and smells fine. I changed the filter about 8,000 miles ago and everything looked fine. I was thinking that a valve or something in the vavle body may have gotten stuck. I was looking for other ideas.

Thanks

Taylor