mechanic58 Posted July 3, 2018 Report 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
Imp558 Posted July 3, 2018 Report 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
Imp558 Posted July 3, 2018 Report Posted July 3, 2018 ... and here's the correct chart, sorry. mechanic58 1 Quote
Imp558 Posted July 3, 2018 Report 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
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