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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Best donar car

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G3GM :: G3 :: General Discussion

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Post by Madmax75 Thu Feb 22, 2018 10:15 pm

Ive seen mention of the impala SS / caprice. Also if one goes to an LS witch auto are you using the 350/400/R4 or newer 4L80 or 4L60

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Post by Limey SE Thu Feb 22, 2018 11:53 pm

9c1 or SS impala rear ends, blazer rear disc brakes, front sway bar from Trans Am second gen, you can use a 350th for LS swap but if you have higher gear rear end use the 4l60e the 80 will require you enlarge the trans tunnel

Sure others will ad

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Post by pila Fri Feb 23, 2018 11:34 pm

Interesting thing about the 4L80, and the tunnel ! My buddy across the street has a 4L80 from a 1-ton van we scrapped out, and I was eyeing it to go behind the 507 inch Caddy in my El camino. I guess the tunnel mod wouldn't be all that bad, but would have been easier just after I had the body on the rotisserie for sand blasting.. It likely would have helped the gas mileage, which isn't very good ! Very Happy

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Post by fasrnur Sat Feb 24, 2018 3:48 am

Of course what Limey means is if you have a higher number rear gear, which is actually a lower gear ratio, then you would want some kind of overdrive tranny not matter which one you choose sir.
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Post by Limey SE Sat Feb 24, 2018 1:33 pm

fasrnur wrote:Of course what Limey means is if you have a higher number rear gear, which is actually a lower gear ratio, then you would want some kind of overdrive tranny not matter which one you choose sir.

Right on Buddy Mine is 2.56 rear so I def would not want Overdrive but say you had 3.73 gears or even larger 4.10 you would benefit from an Overdrive trans

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