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Transmission and DriveLine Questions
Ask all your Transmission and DriveLine Questions. Tranmission, Drives shaft, Rear End, Gears, etc
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Old 08-13-2017, 11:12 AM   #1
jamie9227
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Default Need Your Opinion Please! (gears)

So last week after a car show, I broke the rear end in my '56 while doing a burnout. Spider gear failure.

It was a 3:73 open rear end. Not a biggie, because I bought a complete diff out of a 62ish Pontiac with 3:55 and a factory posi and I've been waiting for the opportunity to install it.

What my concern is, I can't decide if I should run the 3:55 gears, or buy a set of 4:11. I don't want the car to perform any less than it does now. I only run a th350, but highway rpm isn't an issue for me because I haul it if I go any long distance, and also I have a 700r4 that someday will end up in the car.

the plus side of the 3:55 is that its already set up and can just be installed as is, where as if I buy after market gears I will have to have them set up.

I don't baby this car, and really don't want to lose performance.....

what do you guys think?
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Old 08-13-2017, 11:21 AM   #2
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Run the 355. It will match the 700r better later.
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Old 08-13-2017, 11:32 AM   #3
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Run the 355. It will match the 700r better later.
All in with Ray, may actually work better with that 3.06 first gear. If it was an oem rear you broke it was a 3.70.
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Old 08-13-2017, 12:03 PM   #4
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Yes I think it's a 3.70.
I suppose I'll need to cut 1/8" from my axles after reading another thread with mikey info.

I just hope I don't break the new set
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Old 08-13-2017, 12:11 PM   #5
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jamie....Read this thread posted at CT and DZ Auto's reply: http://www.chevytalk.org/fusionbb/sh...rch/1/#1557551
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Old 08-13-2017, 12:13 PM   #6
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Originally Posted by jamie9227 View Post
Yes I think it's a 3.70.
I suppose I'll need to cut 1/8" from my axles after reading another thread with mikey info.

I just hope I don't break the new set
A 62 Pontiac is a 9.3 , so why are you cutting axles. Another point not sure they offer a 3.55 in the 9.3.
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Old 08-13-2017, 12:16 PM   #7
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Cutting axles 1/8'' is when you install a factory posi in a 55-56.Are you keeping that rear,and rebuilding? The Pontiac rear doesn't require it.
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Old 08-13-2017, 12:33 PM   #8
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pontiac rear axle/differential is a totally different animal than the stock '56 axle assembly. no parts are a crossover. unless things were different in canada.
Agree 100% I think that's the point Steve and I were trying to make.
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Old 08-13-2017, 01:16 PM   #9
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Canadian pontiacs run the same diff as a Chevy 8.2 or 8.4 whichever it is
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Old 08-13-2017, 02:18 PM   #10
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Quote:
Originally Posted by jamie9227 View Post
So last week after a car show, I broke the rear end in my '56 while doing a burnout. Spider gear failure.

It was a 3:73 open rear end. Not a biggie, because I bought a complete diff out of a 62ish Pontiac with 3:55 and a factory posi and I've been waiting for the opportunity to install it.

What my concern is, I can't decide if I should run the 3:55 gears, or buy a set of 4:11. I don't want the car to perform any less than it does now. I only run a th350, but highway rpm isn't an issue for me because I haul it if I go any long distance, and also I have a 700r4 that someday will end up in the car.

the plus side of the 3:55 is that its already set up and can just be installed as is, where as if I buy after market gears I will have to have them set up.

I don't baby this car, and really don't want to lose performance.....

what do you guys think?
It sounds like to me you like a performance ride and have some fun, not your daily cruiser. If I were you I would go with the 4:10 gear. You don't do any highway driving so why do you need a 3:55 gear set? I'm just giving my opinion based on your driving habits. You need to install the gear set that fits your driving habits, not other peoples habits. When I had a big block in my 56 I loved going from light to light and getting on it when ever possible and had a 4:10 gear set almost installed 4:56"s, but now i'm into just cruising with my daily driver, 350 with a 700r4 with a 3:73 rear gear. It's really your choice. Knowing your own driving habits. like not babying it, tells me you won't be happy installing a 3 something gear set, that others use just to cruise around in and hit the highway. Just my opinion.
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