very harsh 1 - 2 shift started suddenly hasnt stopped

Asked by May 13, 2017 at 04:37 PM about the 2007 GMC Sierra 1500 SLT Ext. Cab 4WD

Question type: Maintenance & Repair

1 Answer

105,485

Most likely it is the shift solenoids, a tranny shop can plug in and run separate tests on the unit and then tell you what it will take to fix it.

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