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GM 10-bolt R&P question

Discussion in 'The Hokey Ass Message Board' started by Bigcheese327, Nov 4, 2011.

  1. Bigcheese327
    Joined: Sep 16, 2001
    Posts: 6,686

    Bigcheese327
    Member

    The more I research the GM 10-bolt axle, the less I seem to know. It almost seems disingenuous to say “10-bolt axle” when in reality it seems like a whole family of axles.

    Rather than try to become an expert on the subject, I’ll just ask here: What other rings-and-pinion sets will interchange with an S10 axle? Specifically, I’m interested to know if the 2.56s from a ‘68 LeMans or the 2.73s from a ‘68 Camaro will replace the S10 pieces.

    Probably not, but it doesn’t hurt to ask.

    -Dave
     
  2. mysteryman
    Joined: Apr 20, 2011
    Posts: 252

    mysteryman
    Member
    from atlanta

    im no expert but your s10 is probably a 7.5 like the 80 regals malibus monte carlos etc.68 camaro should be an 8.2 then i beleive 73 thru about 77 should be 8.5 rearends.also something i learned is your gm cars other than cheverolet used bolt in axles not c clip axles like chevy did. hope this helps.i was building a rearend for my car and it got very confussing
     
  3. greg ducato
    Joined: Oct 19, 2011
    Posts: 29

    greg ducato
    Member

    Some S-10's used an 8.5 ring and pinion but only the later models. The last 1997 I parted had the 7.5 as mentioned in the previous post. If you use a 2.56 gear and carrier you cannot swap higher numeric gears onto the carrier, you have to start with the 2.73 and up carrier to use 3.08, 3.42 , 3.73 etc.
     
  4. Bigcheese327
    Joined: Sep 16, 2001
    Posts: 6,686

    Bigcheese327
    Member

    I actually want the highway gears in the S10 axle (which I don't yet have). So it sounds like if I get an 8.5" S10 axle, I can swap the LeMans 2.56s, carrier and all, in? What year S10s use the 8.5"?

    -Dave
     

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 46,902

    squirrel
    Member

    or get the gears from a 78-80 GM A body like a malibu or regal or cutlass. Before they got overdrive transmissions, they had low numerical ratio gears. And the 78-up models used the 7.5 rearend.

    Of course if you have an engine that makes some power, then go with the 8.5" rear....the 7.5 is ok with a 305, but iffy with a hopped up 350
     
  6. 69Chevelle454
    Joined: Nov 6, 2010
    Posts: 350

    69Chevelle454
    Member
    from Texas

    GM used the 8.2 Ten Bolt rear ends until 1970 after that they switched to the 8.5 but the 8.2 is incredibly strong as is the 8.5. I have an 8.2 with a TH350 and run 3.73s its not bad on the highway, around 2800rpm @ 65mph. What year is the S10? 8.2 ring and pinion sets will NOT swap out with an 8.5. So if you have an 8.5 and are getting gears from a 68 LeMans with a 10 bolt (meaning an 8.2) it wont work.
     

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