For your information I am a GM trained mechanic, I also am a moderator on this board.
BlazerLT's suggestion of replacing the fluid does apply and it is a known fix for some trans issues.
Yes GM has a bulletin on this problem but not all problem transmissions will be fixed by the bulletin. Just because you have the same problem with your trans doesn't mean this bulletin will fix your problem.
If you read the bulletin it does not say "If you have this problem replace these parts". What it does say is to drop your trans pan and look for metal on the magnet, which would of been done if you follow BlazerLT's advice.
As a GM dealer tech I see the people come in with bulletin in hand, telling me to do this bulletin to fix there problems. Many times the owners have failed to read the bulletin. Some times they don't have the problem and sometimes the bulletin doesn't apply to their trucks. And even sometimes they think they have the problem because they see a bulletin on it.
At the bottom of every GM bulletin is written this!
Quote:
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GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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Now as a moderator on AF I am appaled by some of the remarks that are posted here. I wouldn't of had a problem in handing out a ban for the insults posted. You guys have a very smart mod who wants to help you and who didn't want you banned for the insults. So stop the insults or I will be banning you using the AF guidelines the members agree to when they sign up.