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Old 12-08-2008, 11:10 AM
RC1488 RC1488 is offline
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Re: 2001 Transmission shifts hard from 3rd to 4th

It could be the speed sensor. I would replace it with a junk yard one.
Also, make sure your charging system is in check. These trannys are very picky about the voltages they see.

Ive also read that removing the battery cable and then re attaching it sometimes helps. This makes the PCM re learn your driving habits and hopefully smooth out the shifts.
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