When I floor the gas pedal very, very, very quickly, it drives until 3000RPM, then it seems to shift into neutral all by itself, and my engine jumps up to redline. however, the gearshift is still at d5 and the indicator says d5. is this normal (some protection feature) or a problem? i have a rebuilt 00 tranny so it shouldn't be defective. also, i have to try really hard for my transmission to do this as just laying on the gas doesn't cause this; i need a very quick push. please help, thanks!