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S10 rear axle ??

Discussion in 'The Garage' started by bablazer73, Dec 9, 2006.

  1. bablazer73

    bablazer73 1/2 ton status

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    My buddy has a 2 wheel drive S10 Blazer he's building up. 355 smallblock on nitrous. we know he's gonna blow up the 7.5 rear axle, just don't know when!:doah: :doah: We are trying to find a larger axle to stuff into it, without buying a custom narroewd axle? the width is 47" from backing plate to backing plate. I thought maybe an explorer 8.8" might work, but the 1 he measured was 57". wide. Anybody know what might fit width wise? mounting doesn't matter, he has a ladder bar suspension for it.
     
    Last edited: Dec 9, 2006
  2. HarryH3

    HarryH3 1 ton status Author

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    Get a rear end from a ZR2 version of the S-10. They came with an 8.5 inch 10-bolt rear end. It certainly isn't King Kong strong, but it's better than the 7.5 incher! (Amazingly enough, GM also put the 7.5 inch under Firebirds and Camaros!)
     
  3. 54inches

    54inches 1/2 ton status

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    You can also get one from a Blazer, some came with the 8.5. The 7.5 lasted in my 3rd gen until about 12.2, and about 350 horse. It was a stick with 12" of rubber on each side.
     
  4. diesel4me

    diesel4me 1 ton status Premium Member

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    maybe..

    I had one customer at the junkyard I worked at that had a V8 S-10 --he used a 9" Ford rear from a 60's Mustang,after grenading the stock rear end.--he claimed the spring pads didn't have to be moved,but I didn't believe him!...he may have been right,maybe not..but it appeared to be the right width, and you cant beat the strength of a 9" Ford rear..

    I'd take a tape measure to the junkyard and start measuring!..you may find a Granada or Lincoln axle with disc brakes might be a close fit..older Ford Bronco's from the 60's had a narrow 9" rear also..:crazy:
     
  5. beater_k20

    beater_k20 Banned

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    never seen a Granada with rear discs. and the Lincoln rear uses a 5 on 5 patternt where the S10 will use a 5 on 4 3/4
     
  6. 3 on the tree

    3 on the tree 1/2 ton status

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    If bolt pattern is not an issue, look at a Scout II rearend. Dana 44s or 45s. Most came with posi, and 4.10 gears are pretty common. Depending on your part of the country, they can be dirt cheap.:D
     
  7. b454rat

    b454rat 1/2 ton status Premium Member

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    Early Ford 9" is a close match and strong. S-10s that came with the 4.3 have the bigger rear in them, but can't remember if its the 7 5/8 or 8.5.
     
  8. HarryH3

    HarryH3 1 ton status Author

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    Not unless that changed somewhere over the years. I've got a '91 S-Jimmy that I bought new with the 4.3 and it came with the 7.5 out back. I got to learn about it when I grenaded the rear pinion gear. :( The only S-trucks that I've seen with a stock 8.5 under them was the ZR2 equipped 2-door S-Blazers.
     
  9. beater_k20

    beater_k20 Banned

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    my cousin has an x-cab shortbed Sonoma with a 4.3 in it. it is a ZQ8 truck, basically a Chevy Xtreme with a 4.3 in it (x-cabs got the 2.2). its got an 8.5 under it, and he's had it since brand new.
     
  10. Slapperbar

    Slapperbar Retired Navy NDT Examiner Premium Member

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    Get a Zexel Torsen diff from SLP (iirc 2001 Z28 take outs) and some 28 spline axels from Superior. Living behind my 350/TH350 91 S-10 and I aint nice to it.
     
  11. thedrip

    thedrip 1/2 ton status

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    I bought a 2003 regular cab shortbed, 4.3 5spd s10 from the dealer, it had a 8.5 in the back as well. 7.5 is definately the norm though.
     
  12. Slapperbar

    Slapperbar Retired Navy NDT Examiner Premium Member

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    Also 91 was supposed to be the break year for the 26 spline axels. I've found them in 93's. Should be 28.
     
  13. HarryH3

    HarryH3 1 ton status Author

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    I've got the Torsen in mine now. Got a brand new take out from SLP for $75 and shipping, but that was 3 or 4 years ago. :cool1: I figured that I might as well upgrade it since I had it apart anyway to replace the ring and pinion.
     
  14. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    the 7.5" and 7 5/8" rear ends both use the same housing and same carrier. the only difference is the ring gear diameter. all the 4.3 s10s should have the 7 5/8" rear end in it. not saying they are much stronger, but gm didn't put the 7.5" in the 4.3 trucks.

    id try to find a s10 8.5" rear, suppose to be super strong in the s10s compared to the 7.5" or 7 5/8". or get a 9" from a f150 and have it narrowed.
     
  15. Slapperbar

    Slapperbar Retired Navy NDT Examiner Premium Member

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    GMPP says the 7.5 rear is good into the 10's. How many times is a different story because they didn't say.
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    At what point did the S10's get 4.3's? The 7 5/8" didn't exist until the late 80's. All the GM mid size cars (excluding things like the GN and 442) in the 80's got 7.5's whether V6 or V8, and even some of the full sizes (Caprices) got the 7.5 as well.

    It's my understanding the 7.5" is nothing other than a year difference, just like the 10 or 12 bolts in the trucks.
     
  17. MaxPF

    MaxPF 1/2 ton status

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    I agree with the other posters about finding an S10 P/U or Blazer with the 8.5" 10b in it. It's about the easiest swap you can get...
     
  18. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    the s10s got the 4.3 in 88 i believe. they still made both the 7.5" and 7 5/8" rears threw at least 91 i know of. i had a 89 and 91 s10 with a 2.5 that had the 7.5" and a 88 and 92 s10 blazer that had the 7 5/8" rear.
     
  19. Confedneck79K30

    Confedneck79K30 3/4 ton status

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    an 8.8 from an explorer, 01 or newer, disc brakes too....
     
  20. bablazer73

    bablazer73 1/2 ton status

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    He looked at the explorer axle, it's almost 10" wider!
     

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