3.5

definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
37,500 miles

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problem #2

Jul 122013

Sierra 2500

  • 45,000 miles
The transmission began to slip. At times, I had to stop the truck and put in park before it would engage in drive. Finally it lost all but 1st gear. Took to dealer and torque converter had to be replaced. GMC made me pay half the $3200 repair. I do not live in a cold climate. A heavy duty truck should not be losing the transmission at less than 50,000 miles!

- Woodstock, GA, USA

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problem #1

Dec 152010

Sierra 2500 4WD 8-cyl

  • 30,000 miles
I have a 2006 GMC Sierra 2500 with the lbz duramax and allison transmission. Two of the transmission coolant lines began leaking transmission fluid at the crimp ends in Dec of 2010. The truck only had 30,000 miles, but was the 36 month warranty period. Service under warranty was denied. An on-line search reveals several others have complained about this issue and that the dealer installed oem replacement lines are no better (developing leaks soon after replacement), yet no tsb or corrective action has been issued by GM. Leaking transmission fluid is a fire and environmental hazard. The leaks are getting worse.

- Muskegon, MI, USA

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