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S-10 Read End Questions

Discussion in 'The Hokey Ass Message Board' started by fanbladeus, Feb 13, 2010.

  1. fanbladeus
    Joined: Dec 27, 2007
    Posts: 24


    hey guys

    I've been trying to find specs and info on the stock S-10 rear ends. Basically, if I'm building a car do I want to trade for something different? I'm thinking of trading up to a ford 9 inch, but I wanted to do the research first to see if I should just keep the S-10 rear end.

  2. scrap metal 48
    Joined: Sep 6, 2009
    Posts: 5,617

    scrap metal 48

    What are you putting it under and how wide a rear end do you need??????
  3. S10 Rear Axle Info

    There's 3 widths of S10 rearends.
    Doesn't matter if it's a Blazer or a truck, they share.

    WMS to WMS width
    55" = 2WD
    59" = 4WD
    63" = ZR2 off road option

    7.5 vs 8.5 school
    8.5 rearends are not common.
    Look in 2nd generation S10's that originaly had a 5 speed trans.
    Disc brakes were an option in '95 and became standard about '99.

    7.5" rear end.
    The axle tubes are straight where they enter the pumpkin
    The rear end cover has a more squareish shape

    The housing cover is almost completely round
    There's a bulge in the axle tube just before it goes into the pumpkin

    Another bit of S10 axle info:
    Look in the glovebox for the production "data plate" sticker.
    It has the RPO codes to determine ratios and diff type.

    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

    4:10 posi rear would have two RPO's.
    GT5 & G80

    Exceptions to the rules:
    If you find only a GQ1 on the data plate and no
    "GU" or "GT" codes, then it's an open diff "standard ratio" of 3:08.

    If there's no "G80" or "GQ1" it's an open diff.
  4. scottybaccus
    Joined: Mar 13, 2006
    Posts: 4,106


    I never saw an S10 with an 8.5" axle. They all had 7.5" or 7.625" axles, to my knowledge. (I think the ZR2 4x4 S10 had 8.5" axles in that suspension package) The 7.5" was known as a weak axle, but the 7.625 was pretty strong and used in the F-body, S10, Astro, etc. after about 1988, I guess. The '93 & up units are plentiful and strong.

    I used to order the Auburn limited slip carriers from Lingenfelter Performance for $75. They were new OE take-outs that LP was replacing with a better unit.
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  5. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 23,020

    Jalopy Joker

    need more details on what you are building.
  6. Look for the 8.5 ring gear rearends in 2nd generation 2WD V6 5 speed Blazers. If it has a New Venture trans, it probably has the 8.5 rearend. They're more easily found in Blazers or Jimmys than pickups. I've bought/sold a few but never personally seen one in a pickup. I know they came in non-ZR2 pickups because my friend has one he installed in his 1st Gen V8 Blazer.
  7. Bigcheese327
    Joined: Sep 16, 2001
    Posts: 6,644


    An old thread with some good information. Can anyone confirm that the spring-perch distance on an S10 rear is 38.5" center-to-center? Thanks.

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