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Old 11-21-2008, 11:01 AM   #7 (permalink)
EcoModding Apprentice
Join Date: Sep 2008
Location: Indiana
Posts: 131

Impala - '04 Chevrolet Impala base
90 day: 32.84 mpg (US)
Thanks: 0
Thanked 2 Times in 2 Posts
Yeah, sadly the initial look at the two transmissions side by side (4t65e vs 6t70/75) show a bolt pattern difference (which should be adaptable with the right plate and extention for the input shaft) but the mounts, size and many other differences would make this a difficult at best swap. Still have to research things more and get physical dimensions and such to make the final decision. Supposedly the 4t65e I have has a 4th gear ratio of .70 while I see CFG83 found info suggesting a 6th gear ratio of .742... which would actually increase my engine rpm in that gear...hmmmm. LOL pros and cons...
Had not found a 4th gear swap for my trans yet, although I would hope one is available. Did find a link in lazy browsing yesterday that showed some performance transmissions of my type... ah well.
Thanks once again for the info you folks are helping me find!!
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