mechanic58 Posted July 3, 2018 Report Share Posted July 3, 2018 I have an '06 Grand Prix GXP with an LS4/4T65E HD combo. I have spent quite a bit of time searching trying to figure out what the final drive ratio is in this transaxle and I can't nail it down. I do know there were 3 different ratios available for the 4T65, I just can't nail down which one is in the one I have. Anyone got any idea? The ratios available are 2:86, 3:05 and 3:29 I do believe. Quote Link to comment Share on other sites More sharing options...
Imp558 Posted July 3, 2018 Report Share Posted July 3, 2018 There's an aluminum tag in a bitch of a spot, facing the firewall on the passengers side of the tranny. Whatever you do don't clean it with solvent, the numbers are painted on. mechanic58 1 Quote Link to comment Share on other sites More sharing options...
Imp558 Posted July 3, 2018 Report Share Posted July 3, 2018 ... and here's the correct chart, sorry. mechanic58 1 Quote Link to comment Share on other sites More sharing options...
mechanic58 Posted July 3, 2018 Author Report Share Posted July 3, 2018 Awesome, thanks. Quote Link to comment Share on other sites More sharing options...
Imp558 Posted July 3, 2018 Report Share Posted July 3, 2018 I did that with my hard copy at work, this is the mother load here: http://gmtuners.com/transmission/ mechanic58 1 Quote Link to comment Share on other sites More sharing options...
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