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post #1 of 6 (permalink) Old 02-26-2019, 08:14 PM Thread Starter
Join Date: Feb 2019
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1963 impala

Hi guys I have a 1963 Chevy Impala four-door I have a 327 Bored 30 over with a mild cam.Camel hump heads ported and polished with 700R transmission Now would like to change out my rearend ....any suggestions ...
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post #2 of 6 (permalink) Old 02-26-2019, 11:03 PM
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Stock rear end will hold the torque of that engine, if you were worried about breaking it. Are you looking for more gear for better acceleration?

If so here is a 3.70 gear set for your car. Keep in mind that an OD tranny drops that final ratio down to a 2.59 gear because of the 30% OD. A 4.10 would yield an effective 2.87 ratio.

The 3.70:1 gear set can be founf here:

the bearing and seal kit is sold here:

The 4.10 is offered here:

Big Dave
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post #3 of 6 (permalink) Old 02-27-2019, 09:48 AM
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Also keep an eye open for a "P" case differential. These are posi-traction rear ends so you spin both wheels instead of only one when you get on it and have enough torque and gears. They have kits to convert your stock one, but I would definitely have a professional shop set it up for me. Setting up proper gear lashing is almost an art form.

If your looking for something other than an original rear that will bolt in you only option is a BOP (Buick, Olds, Pontiac) rear end out of their B body cars from 1958 to 1964. They can be a little stronger and on the upscale cars they tended to check more option boxes more frequently to Posi-traction.
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post #4 of 6 (permalink) Old 02-27-2019, 11:40 AM Thread Starter
Join Date: Feb 2019
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Thanks guys I just want to make sure it would hold my engine and transmission it's got definite Torque ...gearz seem to be right on..
I will definitely have it checked and gone through To make sure everything is right....
post #5 of 6 (permalink) Old 05-12-2019, 11:53 AM
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I am running the stock rear end with a limited slip on my 327 (bored/stroked to 383) which makes 370hp and 420 tq. with a strengthened 700r4. Works great I think I have 3.73 gears (strange engineering gears) They whine a bit around 40mph. I should have stayed with stock gears, as I hear that you don't run into that with stock gears. The 700r4 gives a plenty low first gear so 3.73 may not be needed.

1964 Impala 4 door sedan

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post #6 of 6 (permalink) Old 05-12-2019, 12:46 PM
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Whining isn't whether the gears are stock or not but in the rear end set up. Drag racing gears are not suitable for the street because they are too soft, (wear out in short order) so that the gear tooth bends when you drop the hammer rather than breaks off. Great for drag racing but noisy on the street.

Even a properly set up gear will make noise if it was not broken in properly. The gear teeth slide over each other (under a tremendous load) and have to lapped into each other to get a perfect fit. That is why they have to be broken in properly.

Big Dave
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