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S-10 truck vs. Blazer rears

Discussion in 'The Hokey Ass Message Board' started by Pluedy, Sep 17, 2012.

  1. Pluedy
    Joined: Aug 1, 2012
    Posts: 9

    Pluedy
    Member

    I'm hunting for an S-10 4x4 rear end to put in a 52 Chevy coupe. I know the truck rear is a good fit for this application, but can anyone tell me if the rear from a 4x4 S-10 Blazer or S-15 GMC Jimmy is the same as the unit used in the truck?
     
  2. The blazer rear is a little bit wider, the 2WD truck is 54.25" flange to flange if that helps.
     
  3. gsport
    Joined: Jul 16, 2009
    Posts: 677

    gsport
    Member

    not sure about the truck one.. i've got a 95' 4x4 blazer rear under my 50, it's a perfect fit.. you'll need to cut off the mounting brackets and weld on two new spring perches ($13 at Speedway.com)
     
  4. Pluedy
    Joined: Aug 1, 2012
    Posts: 9

    Pluedy
    Member

    gsport..what is the ratio in your rear? Do all the blazers from that era have the same ratio?
     
  5. Pluedy
    Joined: Aug 1, 2012
    Posts: 9

    Pluedy
    Member

    I looked the ratio options up...3.08, 3.42 and 3.73 in the 4x4 Blazer.
     
  6. mrconcdid
    Joined: Aug 31, 2010
    Posts: 1,156

    mrconcdid
    Member
    from Florida

    My rear is out of a 2wd blazer it has a 3.73 gear in it. Fits great, I thought the 2wd blazers were narrorer the the 4x4 trucks but wider than the 2wd trucks

    Godspeed
    MrC

    Edit If I remember correctly the blazer rear is 59.5 inches backing plate to backing plate, the 49-54 stock rear is 60in. so its a good fit.
    I am able to run 15x8 standard offset wheels in the back with no rubbing.
     
    Last edited: Jan 29, 2013
  7. chaddilac
    Joined: Mar 21, 2006
    Posts: 14,077

    chaddilac
    Member

    If you haven't found the codes... here's the ones I've been using to look at them!

    GU2 2:73 ratio

    GU4 3:08 ratio

    GU5 3:23 ratio

    GU6 3:42 ratio

    GT4 3:73 ratio

    GT5 4:10 ratio

    GQ1 Open Differential Rear Axle

    G80 Positraction/Locking Rear Axle
     
  8. Yep the 4wd truck is a wider rear. but I don't remember how much wider.

    The rear out of a 5 speed 4 cylinder 2wd S-10 is 4.10:1 if that helps anyone. It is the same center as the late model trans Am and it will take a liken and keep on ticken.
     

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