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Canadian Poncho Homepage -> Canadian Poncho -> Beaumont Power Train Tech Forum -> 12 bolt rear end?
Post Info TOPIC: 12 bolt rear end?
Beaumontster


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12 bolt rear end?
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I'm going to look at a 12 bolt rear end today but dont know much about them. if I turn a wheel in forward direction the other side should turn Bacwards? forwards? its on the ground so will have to raise it to do that . are there any other ways to get a positive ID? If I take the rear cover off im not sure I could tell the differance. ANY PICS OR INFO WOULD BE GREATLY APPRECIATED, Thanks for any help on this



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66 Beaumont SD 396 4 sp (sold last week

92 GMC S/box 383

68 Beaumont Custom 327 auto

The older I get ,the better I was
rabbit64cs


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Put one wheel up with a jack..tranny in neutral ...if you can spin the wheel..not a posi..

Non posi...Then spin the wheel 2 complete revolutions while having some one count how many times the driveshaft rotates. This will be the ratio.

IF the diff is a posi.. Both wheels would have to be off the ground to rotate. Tranny in neutral.


If both wheels are up, keep the tranny in park..wheels will spin in opposite direction for no posi...not at all if posi.

To check posi ratios..both wheels up, and only one rotation of the wheel while counting the driveshaft rotation.


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later...rog

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dcneric


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Note: Truck 12 bolts are not the same as car 12 bolts. If it's from a big car make sure it is a Chevy as some of the Olds, Pontiac and Buick ones are actually a 10 bolt on the inside.

Pull the cover, count the ring gear bolts and verify that the diff has c-clips.

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Eric - Regina, SK

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Beaumontster


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how many ring gear bolts on the 12 bolt?

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66 Beaumont SD 396 4 sp (sold last week

92 GMC S/box 383

68 Beaumont Custom 327 auto

The older I get ,the better I was
rabbit64cs


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I assumed you are looking at a 12 bolt in a A Body? 

12 bolts on a 12 bolt ring gear...

google images for 12 bolts ..educate yourself .

olds used a. Hybrid in the cutlass line,  12 bolt cover , but 10 bolt guts.. No parts available any more..



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later...rog

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I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!
Beaumontster


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right on thanks guys,supposed to be from chevelle.Going to measure my existing ten bolt between drums to compare. and will do a google searh

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66 Beaumont SD 396 4 sp (sold last week

92 GMC S/box 383

68 Beaumont Custom 327 auto

The older I get ,the better I was
HonestDave


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Here's a picture of the 12 bolt Type-C rear in my 65 442.
Also....not sure of what years will bolt up to the original upper and lower trailing arms, or driveshaft. My uppers and shaft look new, so it gets one pondering.
I've been sort of thinking about going back to a stock type diff for my 442, just so I can get highway gears (308) back in it. It's a pig to drive on the highway with 3.73



-- Edited by HonestDave on Monday 6th of April 2015 12:56:37 PM

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