Question about 2002 GMC Sierra 2500HD

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I HAVE A 2002 SIERRA 2500HD WITH 8.1L/ALLISON TRANSMISSION. LATELY IT SEEMS AS THOUGH ITS NOT SHIFTING PROPERLY. CAN YOU TELL ME IF THERES ANY KNOWN ISSUES INVOLVING THIS TRANNY (NOT LIMITED TO THE ONE I MENTIONED) ALSO ANY NOTABLE ISSUES WITH THE 8.1. THE MILEAGE IS @138000. ANY INFORMATION WOULD BE APPRECIATED,

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I have had to replace my (what I think is called) transmission switch. The problem usually starts when the indicator light does not appear on the dash board as to what gear the truck is in. Now mine isn't unlocking the doors when put in park. I think I need to replace it again...sounds like that may be your problem too.

Posted on Jan 31, 2011

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Posted on Jan 02, 2017

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