Well I have the M5OD (Truck in SIG) tranny. So all the shifts are hella smooth (new HD clutch and HD flywheel). It's just when leaving a stop it would cause problems. After I replaced it (TPS), it ran great for about 1 week then it started bucking again, but this time I think the Fuel Pressure Regulator is the culprit. So tomorrow I'm going to check to see if it's seeping gas.