2nd to 3rd shift problem 97 ZG.
Not sure if my searching skills are letting me down but I can't seem to find a discussion covering my problem. Lot's of shift problems but none that sound the same.
The problem is shifting 2nd to 3rd. Used to be only the first shift of the day. I had the spot on the road lined up, slight downhill, plant it, 3500 + rpm, back off, up-shift and all was well from then on.
Now it's happening when warm. It tries to shift up and ends up in neutral. I have to manually hold it back to 2nd until I've got enough road to get the revs up, back off and give it time to up-shift.
I've been told there's a piston seal that goes hard in these transmissions and that I need to pull the transmission and replace this seal. Researching this seems to indicate that this seal would affect 1st to 2nd shift as well. All my shifts are correct, except for 2nd to 3rd. That's the rub; all the threads I find have other issues. Mine is very specific, one up shift not working properly, everything else fine.
Any suggestions much appreciated.