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4T65E HD - final drive ratio?


mechanic58
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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. 

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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.

 

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