Rear Gear Question

[Dan Fahey]

Originally Posted by impstocker

This is a great thread for me as it answers basically my same question. I am building a 1965 Impala with the 396/325 BBC combo for I/SA at 4100 lbs. I will be using the same motor from my 68 Impala I ran but that was a Stickshift car (Jerico) I will be running a Turbo 350 w the 2.75 first. I will be using the rear from the 68 which has 4:88's in it. I do have a set of 4:56 which I thought might be better with the Turbo 350, but i think I will stick with the 4:88's at first. I have heard the same thing going as high as 4:30's, but i feel with the weight of the car the 88's will be better.

I think my best 60' time was a 1.60 with the 68' , but I feel I never got the clutch set-up right (Mcleod Rev-Lok) I did MPH pretty good (114-117 MPH ) that was at 6600 RPM through the traps, so I am hoping with the automatic I can see the full potential of this combination, seeing that the index is 2 tenths quicker than when i last ran! (I ran 11.70's with the 68)

Any input this way would also be appreciated.
Will Lamprecht
Div 1, 65 imp big ole chevy

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Yeah this is a great thread.
My 1969 Impala still under re-construction has 5.13's.
Have a Budd Rowe built 350/255 in storage with an early cam.
The Dyno shows it is all done by 6000rpm.

Building it to run Stock. For now will run Pure Stock until a modern cam is installed.
Still have the 3800 TCI Converter and TurboAction 350. This will definitely need some upgrade.

Will's 396/325 would be a 427/335 for my car and may consider the larger engine.
Both have the same cam and the shift points should be lower.
Think it is a better combination than the 427/390.

Would need the T350 with a 2.75 gear for either car.
Get the feeling the 5.13's need to be 5.38's for the 350.
But the 5.13's maybe be too much for a 427.

Dan