Rear end ratio change

Tiny
BEZZELLHOTMAILCOM
  • MEMBER
  • 1964 CHEVROLET IMPALA
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
I have the car listed above with a power glide transmission with 1969 nova 350. I am running 3,200 rpm's at 70 mph. Would like to be running 2,000 at 70 mph. What ratio do I need to change in my rear end to achieve this? Or will it lug on take off?
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Wednesday, July 31st, 2019 AT 9:17 PM

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Tiny
STEVE W.
  • EXPERT
Welcome to 2CarPros. The "common" rear ratio in the 1964 Impala with an automatic was 3:36 - 1. There was a 3:08 as well that came behind a P-Glide. That is about as tall as you would want to go really. To drop the amount you want isn't possible with the power-glide. You might be able to get a bit closer if you swapped an OD transmission like a 700R4 into it.
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Wednesday, July 31st, 2019 AT 10:19 PM

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