I am working on a 69 camaro with a muncie.
I beleave it came with a 10 bolt 8.2 rearend from the factory.
Will the driveshaft length differ if I put in a later model 8.5 10 bolt?
How about a 12 bolt?
Are the 8.2 & the 8.5 housings the same length from the axle centerline to the end of the pinion side of the housing casting?
Will a pinion yoke from a stock 8.2 fit on the 8.5?
Would that give me the right length for the original driveshaft?
I did the same swap about 2 years ago. Went from a 3:08 peg-legger to 4:11 posi in an 8.5 rear. Behind my 4 speed it was like night and day. I also upgraded the rear mono springs to Hotchkis at the same time. You will need make sure your new rear has perches that accept whatever you are running now.
I did need to get my driveshaft shortened 7/8 of an inch. Cost was $100 with all new u-joints on both ends.
Gas mileage? Poor at best. The car has only been seeing maybe 250 miles a year for the past 5-10 years, so I was ok with putting a real tall gear in it. I don't drive on the highway much, if at all. I will be upgrading to a TKO or overdrive some time in the next 5 years so I was kind of thinking that the 4:11 would be ok.
If you drive on the freeway, I'd go no higher than 3:55. With my 235/60 14's, I am turning close to 3,500 rpm at 65 MPH. It does rock around town with that gear though.
Good luck with your choice.
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