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Old 04-18-2018, 10:16 PM   #1
TheBrewery
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12 bolt question

Hey guys,

I picked up a 12 bolt out of a 1970 Chevelle and am in the process of removing the Chevelle mounts and adding the truck mounts. During the process I pulled the axles and one has a really odd grove in it.



Is this normal? or did I get some junk axles?

Thanks!
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Old 04-18-2018, 10:44 PM   #2
sweetk30
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Re: 12 bolt question

that is NOT good at all .

time for a pair of shafts and possible redo of the axle .

i would inspect all the bearings and super clean of the inside of that housing .

and why a 12 bolt from a car ? ? ?
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Old 04-18-2018, 10:50 PM   #3
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Re: 12 bolt question

I've seen it before....on a worn out 12bolt under a camaro....
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Old 04-18-2018, 11:38 PM   #4
TheBrewery
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Re: 12 bolt question

Quote:
Originally Posted by sweetk30 View Post
that is NOT good at all .

time for a pair of shafts and possible redo of the axle .

i would inspect all the bearings and super clean of the inside of that housing .

and why a 12 bolt from a car ? ? ?

It's odd because it doesn't look like wear... it looks machined. I'm not too hurt about it as I have to buy new axles anyway so I can stick with the 6 lug setup. It has a open diff with 2.78 gears so all that has to go as well, I just didn't know if it was supposed to be like that.

I got a good deal on it, and the car units have a beefier pinion, and generally more parts available. It's not a huge deal the overall length is 1" shorter than the truck setup, but with the disc brakes it will even out to be the same as the factory drums.

I'll hit it with a scotch brite tomorrow and see if I can spot any scaring.
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Old 04-19-2018, 12:26 AM   #5
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Re: 12 bolt question

No, that is not machined that way. It is simply excessive wear from the axle/wheel bearing. FYI, you can run the passenger 12 bolt gears in a truck 12 bolt housing with the correct bearing.
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Old 04-19-2018, 12:31 AM   #6
TheBrewery
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Re: 12 bolt question

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Originally Posted by Captainfab View Post
No, that is not machined that way. It is simply excessive wear from the axle/wheel bearing. FYI, you can run the passenger 12 bolt gears in a truck 12 bolt housing with the correct bearing.
I thought the truck pinion was smaller and you had to bore it to fit a car pinion. Also I didn't think the carriers were interchangeable.

I'll differ to you guys here, but I own it now so I get to make it work

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Old 04-19-2018, 06:51 AM   #7
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Re: 12 bolt question

When you get done all the welding and cutting make sure the housing is still straight. If the ends pull around with the welding and many do bearing life can be cut way short. Unless you plan to put massive HP the truck 12 bolt is fine. And if you need more rear for that much power its time for a 9".
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Old 04-19-2018, 11:50 PM   #8
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Re: 12 bolt question

http://www.67-72chevytrucks.com/vboa...d.php?t=346472


Quote:
Originally Posted by TheBrewery View Post
I thought the truck pinion was smaller and you had to bore it to fit a car pinion. Also I didn't think the carriers were interchangeable.

I'll differ to you guys here, but I own it now so I get to make it work

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