My 93 w250 has 111k. 5k ago I had tranny "serviced" after a cooler hose blew off(tranny fluid is not good windshield fluid). Ive always maintained truck, so I think tranny is good, but out of adjustment. Ive read here how to adjust shifting, but I'm getting old and rather someone else do it.
It will shift from 2nd to 3rd by encouraging it- full throttle then back off, but tends to want to go back to 2nd with any aggressive throttle input.
Do most tranny shops know how to make correct adjustments? Thanks in advance, Barry