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Old 10-24-2008, 09:51 PM
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New Drive Train, old rear end

I am working through the steps of my project. I have a 1963 Chevy pickup that I bought with an original in line 6. That motor died and i jumped right into a 400+ horsepower V8 and 700r4 transmission.

I am having it hooked up to the original 12 bolt rear end in the truck.

Any thoughts on how long this will last for me and how urgent should I consider an ugrade for the rear end?

Thanks

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Old 10-24-2008, 11:53 PM
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I've been hammering on one of those 12 bolts for years and it's fine.

Mine is NOT stock though. One cannot expect a high mileage rear to be 'just fine' with 3 times the power.

Basically the only thing that's stock on my 12 bolt is the housing. But if you look at it in the perspective of a completely different rear (e.g. 9", dana whatever) you are going to have to spend money to get them to really *work* also.

It's like, pay me NOW or pay me LATER. I kept the 12 bolt because I already had it, it fits, it's efficient and strong for it's weight, and it's the same brand as the truck.
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Old 10-25-2008, 09:26 AM
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I'd check the OE rear differential for condition... maybe a few new bearings & seals are in order?

It may last for many years and miles with moderate (light foot) driving.

If you beat on the differential , something will break
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Old 10-26-2008, 04:21 PM
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Ayuh,....

Being that it Was an I6,... It's goin to be geared Way Too Low....
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Old 10-26-2008, 05:29 PM
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Probably a 4.11 or so ratio. But with the 700R4's .70 OD it wont be bad at all. Around 2.877 final drive.
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Old 10-26-2008, 08:47 PM
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Yeah I'm like ssedan64, the OD ratio and a lockup converter would be just fine.

My '65 C10 has 3.73's. It's a 230 I6 three on the tree. Your '63 very well could have the same ratio. That would be a good setup.
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Old 10-26-2008, 09:52 PM
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Quote:
Originally Posted by C-10
Yeah I'm like ssedan64, the OD ratio and a lockup converter would be just fine.

My '65 C10 has 3.73's. It's a 230 I6 three on the tree. Your '63 very well could have the same ratio. That would be a good setup.

I have the same truck, almost.

I'm hoping that just putting in a posi carrier is all that I'l need to do...
450 hp/tq 454 with a th400. B&M Nitrous Holeshot convertor.
It's not going to see a whole lot of highway driving ... just a show-off streeter.

I guess I'm counting on the tires busting loose WAY before the diff takes a licking. The 250 used to spin one tire ...
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Old 10-26-2008, 10:03 PM
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63 c-10 is a one-year only rear end...worse yet it has one year only axle shafts and those are usually starting to peel where the bearings ride. The stock gear is 3.73, optionals were many, but rarely used.

The 63 housing is a plus, because it has a weld-on panhard bar bracket that can be cut off and swapped to a later GM pickup rear that are cheap & plentiful. My 63 Suburban has a 79 k-10 6 lug rear with 2.76 gear.
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