Joined: Feb 16, 2011 Posts: 64 Posts per day: 0.02 Location: Toronto ON
Posted: Tue Apr 10, 2012 10:26 am Post subject:
I'd find the youngest 06-08 Grand Prix non-supercharged 3800 transmission you can find. It will have a 3.05 diff and should be compatible with your 03 PCM. 05+ LaCrosse 3800 transmissions for the most part will be 3.05 ratio as well; the 08 Allure/LaCrosse trans I used was a 3.05.
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