i got my tranny rebuild december last year.....since then, it caused me trouble a couple of times.......first the solenoids went dead, so i have to bring it back, but now, sometimes i lost my third and forth, but if i pushed it to heavy throttle, it will shift.....what can cause this?? btw, i lost my third and forth without any warning, i was crusing down the freeway, and suddenly the traffic was slowing down, and BOOM, no 3rd and 4th.....it will shift under heavy throttle, but if i push the gas pedal slowly, it will shift to neutral not to 3rd....what gives guys?? thanks a lot

 

anyone??