1989 GMC C2500

Transmission problem
1989 GMC C2500 V8 Two Wheel Drive Automatic 200, 00 miles

my transmission shifts from 1st, to 2nd then 3rd real smooth then I dont hear or feel anymore shifting but the truck seems to be running real ruff when I reach around 55mph like it supposed to shift again or something does it even have a 4th gear or o/d got a manual but it doesnt mention about how many gaers th trans. Has pls help!
Carlos victor
November 2, 2010.

That came with a 700R4 transmission, sounds like the lockup converter solenoid does not function, they're not very expensive to fix try your local transmission shop, just don't let them try to sell you a new transmission

Dr Loot
Nov 15, 2010.