Originally Posted by togtaker
I have the 1st-2nd shift problem. I took to the dealer, they said shift slower. I called customer service, they told me to shift slower. I called Tremec they said that was GM blowing smoke. I sent a letter. They ordered my parts this week. They have a redesigned synchro, also replacing the blocker ring. Not easy to get them to do it, but you have to start with your dealer and keep moving up the chain until you get high enough for them to fix the problem.
IMHO, when the dealership you take your vehicle to doesn't acknowledge the issue with your transmission, it's best to call GM directly and make a formal complaint. I can tell you this works MUCH better than arguing with the manager or advisor. GM will get the regional rep involved and his/her words work wonders.