Rear end ID

[Canuck]

Trying to identify this 12 bolt that was used as a roller in my 71 442. Can’t seem to find anything on the RE code. The K indicates it was made by MCKinnon in Ontario and likely for a GMCanada application. I have no need for this but did not want to junk it if there is some value to someone.


https://hosting.photobucket.com/images/ll49/paulolds/1665A97E-2BED-4DCF-B04F-F92B871C4DB5.jpeg?width=960&height=720&fit=bounds (https://photobucket.com/u/paulolds/p/29c93920-a915-4def-bb76-f3c8784ba5d9?mode=zoom)

[big gear head]

'71 Olds would have the Olds 8.5 10 bolt, which has a 12 bolt cover. It's not the same as the Chevy 12 bolt. A picture of the whole rear end, including the cover, would help.

[L78_Nova]

Pulled a couple Chevy style 12 Bolts out of Canadian Cutlasses over the years... not sure why but they were in there. Some 69's for certain.

[L78_Nova]

To clarify, most were the O style but the odd one seemed to be a Chevy style

[Canuck]

To clarify this is a chev 12 bolt that was in my car,not original to the car and not going back in. I only need to know to see if it appeals to someone looking for a 12 bolt for buildup purposes.

[Too Many Projects]

There is always value in an original Chev 12 bolt, even if it's only $200 as a buildable core.
The E may represent an Eaton posi. Do you know if it is a posi and what the ratio is ?
I sold a core 12 bolt on here last fall and shipped it to TX via Fastenal.

[Zman1969]

'71 Olds would have the Olds 8.5 10 bolt, which has a 12 bolt cover. It's not the same as the Chevy 12 bolt. A picture of the whole rear end, including the cover, would help.

Freddie I know inside they do look like a 8.5 but bigger! like on steroids! seems like in 70-72 there were several different rear ends each division had till they settled on the 8.5" rear in 71 and 72 like Chevelle and Pontiac were their own 8.2" and the cutlass skylarks got 8.5" Crazy!

[jeffschevelle]

Casting date and casting number on the pumpkin?

[big gear head]

Freddie I know inside they do look like a 8.5 but bigger! like on steroids! seems like in 70-72 there were several different rear ends each division had till they settled on the 8.5" rear in 71 and 72 like Chevelle and Pontiac were their own 8.2" and the cutlass skylarks got 8.5" Crazy!

The Olds rear end actually is a 8.5, but not the same as the corporate 8.5 that went into production in '71. The ring gear is 8 1/2 inches in diameter, the same as the corporate 8.5. The Olds rear end was only used in the Cutlass and 442 from '68 to '70.

[Canuck]

Guys
Appreciate all the info about what went into an Olds from the factory. I already know that.
My question is; Does anybody know what the RE code is for on a Canadian built GM 12 bolt as described in the first post.

[Lynn]

Don't know about a 1971, but 1969 RE is for a 3.23 open diff.
In 1968 it was used to describe a type C rear axle (I think the C is for Chevy or maybe "c" clip???) with 3.31 gears.

I don't remember seeing a 12 bolt with 3.23 gears, so guessing it is a 68 housing.

Can you read the casting date code on the housing? Also, the casting number would be a clue.

Not unusual to find a chevy 12 bolt in a late 60's Olds.