Question about 2001 GMC Jimmy

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Does not back up. when going forward makes a high pitch noise, and does not shift to overdrive

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You have a broken Sun Gear Reaction Carrier (Sun Shell) This is a common problem for the 4L60E transmission. Unfortunately the transmission will need to be removed for this repair.
Any local transmission shop can confirm this with a short road test.
Good luck.

Posted on Apr 29, 2010

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