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I have a 1970 Chevelle Malibu...I know the rear is a 10 bolt...but in 70 were they 8.2 or 8.5's? Any help would be appreciated. Thanks!!!
 

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When (year) was the 8.5 first used in a GM car? And what car/model was it? And only had leaf springs or mono springs. Rear in question 10 bolt 8.5 posi,w/ leaf spring perchs, does not have complete numbers on the tube. Drum to drum 61-1/2" +, axle tube to axle tube 55-1/4" , centerline perch to perch 45 1/4", date L112= Dec 11 1972. Could it be a 2nd gen camaro rear? thanks
 

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Thanks much for answering the questions.What I have seems to be like the corporate rear end and is a nonular case. Do you know if all 8.5 ("N") had nonular case sections?

I'm deciding whether to use this rear end in one of two cars. It has the ratio I want in either case. In one case I would have to cut the tubes and shorten the axles. Thinking a rear end shop may be able to cut out a section off the rear tubes between the perch and center so as to leave the perches welded and end up were the leaf springs will align up with the perch. My other alternative is to leave the existing rear and change the center chunk.
Using this rear on the other car would add 3/4" to each side and may become an issue to remove the tire/wheel easily. It would require a back space of 5" which the wheel I would use come with this back space. This car I kinda want to mini tub and use a tire/wheel of optium size but leave plenty of clearance between springs and fender. If I tub this car I will use a 70's chevelle 8.5 posi rear I have and shorten it for min. bs.
Bottom line is I may end up selling the camaro rear and use the dollars for work on the chevelle rear and or the other rear end. Also have an 8.2 non posi out of a 2nd gen nova that I will sell. It's nice to have all these "rears" but deciding which way to go is challenge.
I will post a pic of the camaro rear soon in hope that it is a camaro. Thanks
 

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An easy way to tell from the rear is the 8.5 had right angle "tabs" on the housing at the 5 and 7 o'clock positions when looking at the diff cover from the rear. The earlier 8.2s are smooth/round in the shape of the diff cover.
The "tabs" are part of the housing reinforcement that came with the redesign making them a much stronger unit than the 8.2.
 
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