after getting the trannie back from a rebuilt, it is shifting way early like around 4,200rpm at WOT to second gear bogging the car really bad i thought this cars were suppouse to shift at 5,200rpm from 1st to second am i right? , i've tried adjusting the TB cable no change, and yes i have new valve springs on the heads, what could be the culprit of this problem, replies and imput appreciated..