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What's the difference?

This is a discussion on What's the difference? within the Drivetrain forums, part of the LSx Technical Help Section category; What is the difference between the different Differentals and what are the best applications for them? Limited Slip Posi Detroit ...

  1. #1
    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    What's the difference?

    What is the difference between the different Differentals and what are the best applications for them?

    Limited Slip Posi

    Detroit Locker

    My T/A is a Semi-DD, but I want the strength and reliability of a bullet-proof 9"
    2000 Pontiac Trans Am WS6 M6: 427ci LS3, Built T56, Moser 9" w/ 4.11 Gearing, Full Suspension, and 6-point Cage.
    2000 Pontiac Grand Prix GTP: Twincharged w/ a T67 Turbocharger
    2007 Chevrolet 3500 Dually Duramax: 3" Downpipe, Dual 4" Exhaust, EFILive Tuning

  2. #2
    2 SS's are better than 1 Jays00ss's Avatar
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    NBM / Silver
    00 SS / 71 SS Elcamino

    Then buy a 9" rearend. No matter what you do to the P.O.S. 10 bolt, Its still a P.O.S. 10 bolt. Do not waste your money trying to "Build up a 10 bolt" it is simply a waste of money and you should put your money towards a 9" rearend. Rule of thumb when it comes to the 10 bolt. "Upgrade, don't rebuild"

    When you do Buy a 9", Depending on your HP, I would suggest 31 spline axles and a Detroit tru-track.

    Myself, I went with 35 spline axles and a Detroit Locker and wouldn't have it any-other way.
    2000 SS Camaro Heads, Large cam, Fast 90, 9"w/430's and locker, yada yada yada... you get the picture

    1971 SS ElCamino 402 Big Block 550HP

    2006 Silverado 2500HD 496 cubic inches of pure muscle

  3. #3
    Drag racing is a disease! RacerBob's Avatar
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    2000 Z28

    I agree. Go with a 9" and the Tru-Trac. This is supposed to be the best combo for a duel-purpose car like ours.
    I just ordered one from EPP. Service was great!
    Good luck with your build.

  4. #4
    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    Quote Originally Posted by Jays00ss View Post
    "Upgrade, don't rebuild"
    Yeah, I follow that theory completely...I was talking about a 9", I just wanted to know the difference, because Moser offers both and I wanted to know which was "better" for a semi-DD.

    Quote Originally Posted by Jays00ss View Post
    When you do Buy a 9", Depending on your HP, I would suggest 31 spline axles and a Detroit tru-track.

    Myself, I went with 35 spline axles and a Detroit Locker and wouldn't have it any-other way.
    What's the difference between 31 and 35 Spline Axles?

  5. #5
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    Sunset Orange Metalic
    2002 Firehawk

    I also bought a 9" from Bob at EPP - Great service and will tell you what you need for your set up.Differance betwwen a 31 and 35 spline is the number of spline count on the axle.Higher number being stronger.35 is what Bob said to get with the Detroit Locker for mine.Set up is a 402 stroker with 12 lbs from a Procharger.Best advice is ask Bob.

  6. #6
    Drag racing is a disease! RacerBob's Avatar
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    2000 Z28

    For a DD, 31 spline will be just fine. In fact, my ride is mostly track (I plan on running slicks) and I still only went with the 31 spline.

    A Tru-Trac (your best limited slip option and the first to use the helical gear design) will suit your needs better for a DD IMHO. It has smoother operation. A locker is noisy and MAY produce undesireable results for you. If I remember, the pros & cons of lockers have been debated here before. Try running a search for additional info.

    By the way, if you go with a Tru-Trac, your only option ina Moser 9" will be 31 spline.

  7. #7
    2 SS's are better than 1 Jays00ss's Avatar
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    Quote Originally Posted by ls1camino View Post
    Yeah, I follow that theory completely...I was talking about a 9", I just wanted to know the difference, because Moser offers both and I wanted to know which was "better" for a semi-DD.



    What's the difference between 31 and 35 Spline Axles?
    35 spline axles are stronger but they only offer a spool or a detroit locker with that option.

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