Transmition hesitates to shift ?

[Zeunh]

Ok the problem I am haveing is that my 4.0 4X4 with automatic tramsmition, hesitates when changing gears from 1-2 and 2-3. It will drop a few rpm then back up again and then change gears. Makes the engine rev a little when it does this so quite noticable. Weird part is it seems to change just great and fine like it should when the truck first starts off..only does it after its warmed up..say 5-10 min driving and it will start. Always changes and doesnt make any bad sounds..just reves then shifts ?

 

[ALYZ1FLR]

Slow warm shifts.

Sounds like the valve body is getting sticky when it expands with heat. Try retorquing the the valve body.
Drop the transmision oil pan, then back off the valve body bolts a turn or two then retorque them to 7 ft\lbs. Good luck. Good time to change the filter while your there.