stock 1956 Chevy 210 rear end strength? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-29-2013, 10:49 AM
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stock 1956 Chevy 210 rear end strength?

i have a 56 chevy 210 that came with a straight 6 and a 3 on the tree, i was wondering how strong the stock rear end was, it has no inspection plate on the back and the whole 3rd member drops out of the front like the ford 9in. how tough is it? and with that engine tranny combo what kind of ratio can i expect? i figure pretty low

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Old 03-29-2013, 10:57 AM
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The rear end in your car was first produced in '55 and was used through '64 in the Chevy full size cars and the Corvette. It has a 8 1/4 inch ring gear. The '55 version was the weakest, but the case was strengthened around '57. There are special P cases that are made to clear the Positive Traction differential that was used in some of these rear ends. There are a lot of after market parts availabel for this rear end. Eaton makes a new Posi for it and there is a company in Canada that makes special bearing caps, axles, gears and other parts that make it much stronger. These rear ends didn't hold up too well to the 409 4 speed cars, but they are not extremely weak.
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Old 03-29-2013, 01:02 PM
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Rear end gears in your car should be 3.70:1, 4.11:1 if you also have an OD trans. The automatic cars had 3.55:1. The 55-56 third members were the weakest of the 55-64 drop-out rear ends. The weakest part of any open rear end are the spider gears. If you don't beat on it, it will last. I'm told that running any more than a 28" tall tire also over-stresses them (when beating on them). Slicks are the worst thing on them. You can make them live, but it takes $$$; contact Aubrey Bruneau of BruneauPerformance.Ca (Canadian site) for ways to strengthen them up. Butch/junior stocker.
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Old 03-29-2013, 02:42 PM
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Ok awesome thanks for the info, I don't plan to be hard on it, I'm putting a low boost supercharged 454 under the hood (keeping compression low and boost at 5 psi or less) and either a 400 turbo or 4 speed not really sure yet, but its mostly gonna be just a cruiser. I didn't do a spring pocket or mini tub so about the biggest tire that I can fit will probably be a 255 and they won't be slicks lol
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Old 03-30-2013, 05:07 AM
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Back in the 70's I drove a 56 chevy to school every day as did a couple of my budies. We kept spare spider gears on hand because that is the weakest link. I would not leave the rearend stock even with a stock 454. There is always that temptation to push the go pedal.
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Old 03-30-2013, 08:49 AM
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I thought auto cars got the 3.36:1 rear, I could have swore thats what is in my 57 Belair 2 door hardtop, Powerpack 283 PG car.

peace
Hog
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Old 03-30-2013, 09:50 AM
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Quote:
Originally Posted by Hogg View Post
I thought auto cars got the 3.36:1 rear, I could have swore thats what is in my 57 Belair 2 door hardtop, Powerpack 283 PG car.

peace
Hog
My 55 had the 3.36s too...maybe Canadian cars had a different stock ratio
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Old 03-30-2013, 12:22 PM
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I had a '55 back in the mid 60's - it originally had a 6 cylinder 3-speed stick - rear ratio was 3.55 to 1. I broke it with the swapped in 283 (not a hot engine - stock cam and 4bbl). Replaced it with an early 60's 3.73 to 1. It didn't look any beefier, but it didn't break either.
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Old 03-30-2013, 07:00 PM
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Yea I think I'm going to go ahead and buy New guts to make sure I won't trash the spider gears or axles and have to take it all out down the road lol
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