Starts out ok in 1st, but never shifts into 2nd, revs to 4k or if you let up a little, then it goes into 3rd, when 4th comes around it revs up. If I drive with the over drive off, it never goes into 4th and it is drivable, just no reverse as well. Anyone who works on these know what I should check? My guess is the 2nd gear servo may not be working, but I can't tell which valve operates that.
Review: no reverse, no 2nd and no 4th. I did put air in the 2nd band per the manual, and it did not move, but the hole to the left of it did move it. HELP!

 

Sounds like it needs a rebuild. I had a rebuild done and had the transgo shift kit put in and no regrets.