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Thread: Rear end swap question
          
   
   

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  1. #1
    Machu10 is offline CHR Member Visit my Photo Gallery
    Join Date
    Jun 2004
    Location
    Des Moines
    Car Year, Make, Model: 85 Chevy Caprice Coupe
    Posts
    9

    Rear end swap question

     



    Hello all,
    I am kinda new to the boards and i am trying to find a little help,
    I have a 1985 chevy full size caprice coupe, I just dropped in a 383 stroker and a extreme duty 700r4, The stock rear is a 10 bolt 7.5 2.56 non locking rear, well needless to say i wanna swap to a posi unit, i was gonna just buy a eaton diff and stick it in the original rear, but now i been hearing that the 7.5 will not hold up to the torque of the 383, I was also told that a 8.5 10 bolt rear from a buick grand national will bolt right up, anybody know if this is true? i would think the GN rear would be more narrow than the caprice? or can anybody recommend what would be an easy swap that i can hunt down in the salvage yards?


    Thanks in advance

  2. #2
    rat_rod35's Avatar
    rat_rod35 is offline CHR Member Visit my Photo Gallery
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    Dec 2004
    Location
    Lansing
    Car Year, Make, Model: 1935 Chevy pick-up
    Posts
    28

    Re: Rear end swap question

     



    Originally posted by Machu10
    Hello all,
    I am kinda new to the boards and i am trying to find a little help,
    I have a 1985 chevy full size caprice coupe, I just dropped in a 383 stroker and a extreme duty 700r4, The stock rear is a 10 bolt 7.5 2.56 non locking rear, well needless to say i wanna swap to a posi unit, i was gonna just buy a eaton diff and stick it in the original rear, but now i been hearing that the 7.5 will not hold up to the torque of the 383, I was also told that a 8.5 10 bolt rear from a buick grand national will bolt right up, anybody know if this is true? i would think the GN rear would be more narrow than the caprice? or can anybody recommend what would be an easy swap that i can hunt down in the salvage yards?


    Thanks in advance

    Well I'm not sure about the swap but the 7.5 in my 98 camaro is still going stong. I do the 1/4 mile thing all summer with no probs. I have changed my gears though. To my knoledge a modified 7.5 is good till about 400 rear wheel hp. If the car hooks hard you could have some problems though.
    I can't afford billet.



  3. #3
    Don Meyer is offline Moderator Visit my Photo Gallery
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    Apr 2001
    Location
    St Cloud
    Car Year, Make, Model: 48 GMC trk & a 66 Rolls Royce
    Posts
    532

    The 9" Ford is going to be easiest to find & they are king of the hill. Lots of info on them on the web.
    Don Meyer, PhD-Mech Engr(48 GMC Trk/chopped/cab extended/caddy fins & a GM converted Rolls Royce Silver Shadow).

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