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  1. #1
    Join Date
    Jun 2008
    Location
    ontairo ny
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    11
    Country Flag: United States

    Rear end for autocross ??

    I;m building a S-10 Autocross truck and I have o change out rear end ,do I look for a posi or run a limited slip
    Thanks

  2. #2
    Join Date
    Aug 2005
    Location
    Hamilton, NJ
    Posts
    4,211
    Country Flag: Swaziland
    Posi and limited slip are the same things.

    Not sure how much power you’ll be running, but some s10s got 8.5” rears. They can be built fairly strong
    Scott from NJ.

    Vent Windows Forever! ... My junk, featuring the Red Dragon ... NastyZ28 ... NJ Camaros & Firebirds

    Feather-light suspension, Konis just couldn't hold
    I'm so glad I took a look inside your showroom doors

  3. #3
    Join Date
    Jun 2008
    Location
    ontairo ny
    Posts
    11
    Country Flag: United States
    Ok i thought posi was for more drag racing and the limited slip was more circle track ??? This kind thinking is probably why I'm a carpenter
    But the truck will be LS1/ auto so 500 hp at the most with no drag racing , I'm hopping to find a swap with disk brakes already on to replace the drum I have now and Thanks for your help

  4. #4
    Join Date
    Apr 2012
    Location
    Woodstock, IL
    Posts
    2,363
    Country Flag: United States
    If you'll be autocrossing a lot, i'd run a Truetrac diff.
    If it's just once in a great while and you're looking to save a few bucks, a clutch-type diff.

    -Dale
    SchwartzPerformance
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  5. #5
    Join Date
    Apr 2006
    Location
    Huntington Beach, CA
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    2,323
    Country Flag: United States
    I'll second truetrac for autocross.

  6. #6
    Join Date
    Aug 2009
    Location
    Phoenix area
    Posts
    226
    Country Flag: United States
    8.5" from a 2wd Blazer. You just have to watch the width as 2wd, 4wd and extended (ZR2?) are different. I have a Detroit Locker with soft springs for my Chevelle with a 9" Ford axle.
    Ric

    2002 s10, DD and AutoX.
    1966 Malibu owned since 1971. Drag car converting to track toy!

  7. #7
    Join Date
    Sep 2014
    Location
    Sun City West, AZ
    Posts
    639
    Country Flag: United States
    Tru-Trac. Just make sure you use the right gear oil as recommended by Eaton.

    --
    Kenny Mitchell
    [email protected]


  8. #8
    Join Date
    Aug 2012
    Location
    Peoria, AZ
    Posts
    1,588
    Country Flag: United States
    Pay attention to rear axle bearings as well. I killed several sets of the sealed axle bearings in my big torino style 9" axle bearings before switching to the A20 style tapered bearings. Some bearings cant take the side loads you'll put on them autocrossing.

    I also killed several clutch style posi diffs before switching to a mechanical locker.
    Lance
    1985 Monte Carlo SS Street Car

  9. #9
    Join Date
    Oct 2004
    Posts
    2,282
    Country Flag: United States
    Truetrac. At the time I bought mine, I recall it was actually cheaper (barely) than the clutch posi by Eaton. As said above, follow the recommend fluid and don't use an additive either.
    Red Forman: "The Mustang's front end is problematic; get yourself a Firebird."

  10. #10
    Join Date
    Aug 2009
    Location
    Phoenix area
    Posts
    226
    Country Flag: United States
    Quote Originally Posted by rixtrix1 View Post
    8.5" from a 2wd Blazer. You just have to watch the width as 2wd, 4wd and extended (ZR2?) are different. I have a Detroit Locker with soft springs for my Chevelle with a 9" Ford axle.
    I just put a Truetrac in my 7.625 S10 10 bolt last Sunday, in place of the g80 Govloc. Have an autoX in a week, but in street driving it this past week, it feels really smooth with seamless engagement. No inside tire spin and able put power out center of corner immediately.
    Ric

    2002 s10, DD and AutoX.
    1966 Malibu owned since 1971. Drag car converting to track toy!