68 vs 72 rear

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July 30th, 2018, 05:04 PM

Big14

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Join Date: Jul 2018

Posts: 3

68 vs 72 rear

hello everyone I’m the new year this week with a question that maybe considered one of old but anyway here it goes.
i have a 68 cutlass that I recently replaced the 8.2 rear with a 8.5 rear from a 72 cutlass. I now have a rear wheel wobble and believe it to be runout of the flange after ruling out other possibilities.
Question: can the rear axle from the 68 fit in the 72 rear?
2nd Question: my 72 rear has the lugs at the bottom so is this the true 8.5 rear

July 30th, 2018, 05:37 PM

Fun71

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Join Date: Feb 2013

Location: Phoenix, AZ

Posts: 13,755

Quote:

Originally Posted by Big14

2nd Question: my 72 rear has the lugs at the bottom so is this the true 8.5 rear

Don't use the lugs for identification of a '72 rear, instead look at the sides of the center housing for two parallel ribs and at the top of the housing for a boss with a bolt hole for the brake hose mounting block.
If it has two converging ribs or only one rib then it is an 8.2 for sure.
The brake mounting boss on top of the center section is the dead giveaway for the 8.5 rear.

Last edited by Fun71; July 30th, 2018 at 05:46 PM.

July 30th, 2018, 06:10 PM

Big14

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Join Date: Jul 2018

Posts: 3

68 vs 72

ok so I do have two parallel ribs on the sides of the housing as well as the brake line bolting up at the top of the housing.
Does the axle shaft of the 68 fit the n the 72 housing