20 Most Recent 2006 GMC Sierra 2500HD 2WD Questions & Answers

could be a problem vacuum hose for the shift accuator or simply dirty oil needing a transmission oil change

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GMC utes seem to be a REAL problem should have bought a Ford or Dodge. Do not belive the OLD story--- If you can not afford a Ford dodge a Dodge

I need a belt routing diagram for an o 06 Duramax with air ps etc

I am assuming you have a manual transmission. First I would check to see if it came with the dual flywheel. If it did then this is the problem. If it didn't then the pressure plate is weak or the clutch is worn out. If it is an automatic, there are several things that would cause this. Torque converter. solenoids, clutch bands, clutch .....