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A forum for the owners and enthusiasts of General Motors B-Bodies from 1977-1990, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!


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    8.5" 10 Bolt out of a 1983 Police Cruiser

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    79treemaster
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    Post  79treemaster Mon Sep 02, 2013 6:52 pm

    I scored a 8.5 10 bolt in the local junkyard. It had a posi in it but the clutches were cooked. So I put a new locker posi in it with a motive 4:30 ring and pinion. I also got the control arms with the sway bar all for a 150 dollars. The axles were 28 spline and it had a 3.08 gear that looked really good. The axles had the 4.75 x 5 wheel setup as well. Got to get driveshaft cut since the 8.5 is longer than the 7.5. Can't wait to get it installed.
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    Post  jacob79caprice2dr Mon Sep 02, 2013 7:30 pm

    Sweet deal man, itll be alot better than the 7.5. Probably had a 2.41 gear in the 7.5 so jumping up to a 4.30 will be alot funner on the streets!
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    Post  79treemaster Mon Sep 02, 2013 7:34 pm

    Yep it sure will. That 2.41 was lazy. After the install I am sure that speedometer will peg at 15 mph.
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    Post  jacob79caprice2dr Mon Sep 02, 2013 8:02 pm

    If not more! lol thats a pretty big jump in gears.
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    Post  79treemaster Mon Sep 02, 2013 10:48 pm

    Yeah I needed to get some gearing to get that big car off the line. If I was sure I was going to stay with a small block I would have went with a 4.56.Twisted Evil 
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    Post  jacob79caprice2dr Tue Sep 03, 2013 10:34 am

    so you have a big block!?affraid 
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    Post  79treemaster Tue Sep 03, 2013 12:07 pm

    I have a 454 sitting on the stand.  I think I am going with a 406 maybe at the moment.  Cylinder heads are going to be the back breaker for the big block.  I want aluminum heads for either motor and the big blocks are roughly 2500.00/pair.  Going with hydraulic roller cam close to .600 lift ish with at least 10 to 1 compression ratio.


    Last edited by 79treemaster on Sat Nov 09, 2013 8:38 am; edited 1 time in total
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    Post  jacob79caprice2dr Tue Sep 03, 2013 2:42 pm

    That would definitely be a deal breaker, id get a nice small block, run 10.5:1 compression, still pump friendly, and like you said a good .600ish lift, perfect street motor and wont weigh as much as a bigblock.
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    Post  youngblood1989 Fri Feb 10, 2017 1:33 am

    Just curious, what did you pull that rear end out of?
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    Post  Myloth Fri Feb 10, 2017 8:16 am

    Old post but it probably came out of a 9c1 Caprice Im guessing .

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