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HELP!!! 4T60 won,t upshift on its own
Posted to Transmission Forum on 7/18/2002 3 Replies

Hello all,

One of my techs put in a new motor in this 1990 Lumina APV (3.1) and now it will not upshift on its own. If you start out in first and manually shift it up through the gears it will work fine and the TCC locks and unlocks normally. Adjusted detent... Login to read more.

3 Replies Received (View Replies)