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Correct pinion angle tunnel mount torque arm

This is a discussion on Correct pinion angle tunnel mount torque arm within the Drivetrain forums, part of the LSx Technical Help Section category; correct pinion angle is from -1 to -3 at maximum that means the rears pointed down and so is the ...

  1. #1
    Member Rk ws6's Avatar
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    Red
    2001 ws6

    Correct pinion angle tunnel mount torque arm

    correct pinion angle is from -1 to -3 at maximum that means the rears pointed down and so is the drive shaft so upon load the drive shaft rolls and your driveline is in a perfect straight line... am i right... lol

    maybe i just need the stronger driveshaft i just ordered...

    or the adjustment is still wrong..

    somebody help lol i need advice

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    How is it grabbing at launch?
    Too much normally creates hop.
    Too little normally creates spin.

    http://www.ssz28.com/tech/Pinionangle.html

    Broken DS's are from weak DS's or REALLY extreme angles.

  3. #3
    Member Rk ws6's Avatar
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    im on 28inch tall et street radials at 16psi on my 15 greg welds it hooks and doesnt spin at all....funny thing is i baby launched around 2500rpm and broke the lastest driveshaft which was saturday.... and i regularly launch from 3500 to 4500

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    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    Maybe I should knock on wood cuz I haven't broken a DS yet. Plenty of stripped gears and burnt pinions and bearings though.

    I'm set at a tad over -2* and the car dead hooks (that's what took the last set of gears even though I'm an A4) after a burnout stalled at 2500 on MT's.

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  5. #5
    Moderator Firebirdjones's Avatar
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    You look like you are still running the stock aluminum drive shafts. So I wouldn't blame their breakage soley on your pinion angle. I've seen those things twisted like prezels on bone stock cars and street tires.

    In all honesty if you plan to race the car that much and launch at those rpm levels, you should really step up to a stronger piece. For very little money you won't have this headache, and take a chance also of taking the transmission or your rearend out with it. I've broken tail shaft housings off the tranny from shoving the driveshaft forward when it breaks. Don't fool around with those stock shafts.

    And yes your pinion angle sounds in the ballpark. Anywhere from -1 to -4 degrees is acceptable for a street/strip car.

  6. #6
    Member Rk ws6's Avatar
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    problem cured... pinon angles perfect stock driveshafts just couldnt take acttually hooking lol sphon top gun driveshaft ftw!

  7. #7
    Member Eganslp's Avatar
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    That's what I'm afraid of happening to mine after the stage 2 tranny setup and 9" 40spline axles

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  8. #8
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Rk ws6 View Post
    problem cured... pinon angles perfect stock driveshafts just couldnt take acttually hooking lol sphon top gun driveshaft ftw!
    I figured as much.

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