My 94 F150 after is warms up will sometimes shift down or feel like its not pulling its eractic had the transmission rebuilt three times in the last year (under warrenty from rebuilder) this has not cured problem it seems more promident in warm weather and stopping and restarting engine seems to cure it for a good while but i am lost as to what to do next any one else had this problem

 

In any of the trans combo's that were availible to that truck (the E4OD or 4R70W, both were used), if you've had this problem, it might be very much worth it to check out the engine perfomance first, as it can be difficult to ascertain whether the trans really is doing it on it's own, or if the engine just can't put out the right amount of power and the trans is shifting around on its own to match the power output of the engine.
On something this old that's been apart a few times, it's very easy to imagine either problem being the case. I would recommend getting a very thourough diag done on this powertrain by an old fart like me that's done a lot of work on EEC-IV trucks. It would be worth it.