Rear end gear ratios: What is high vs low? - Chevy Nova Forum
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Old 13th-February-2010, 12:00 PM   #1
Phil Ayres
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Rear end gear ratios: What is high vs low?

I have a 72 Nova w an Lt1 350 with a th350 (3500stall). I am not familiar with rear ends at all. Only one tire spins.
I would like to get a posi and figure out what gear ratio I have. Can I do this without counting the teeth?
Can I buy some type of gear that will lock the axles together? Is that a bad idea vs. finding a stock posi rear end?
I do not have a tach so i can't tell you my estimated speed vs. RPM, but I don't want something too low, I'd like to travel south with the car sometime.
What is a good high gear ratio that still has some bite at takeoff?

I appreciate your time and opinions.
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Old 13th-February-2010, 12:26 PM   #2
Slow Nova
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If its going to spend a decent amount of time on the highway, I would stick some where around a 3.42 rear gear. If you want to get a close estimate of what ratio you currently have, jack up the rearend of the car. Mark the driveshaft and tire, count how many times you have to rotate the driveshaft to get the tire to rotate once. Example, if the driveshaft rotates approx. two and three quarter times when the tire has gone around once, then you have a 2.73 rear gear. There are aftermarket pieces that you can put in place of the spider gears to make it a cheap locker, but they are noisy and chatter on turns. If its going to be a street car, find a limited slip unit. Good luck with your build.
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