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Torque Arm for Moser 9"

This is a discussion on Torque Arm for Moser 9" within the Drivetrain forums, part of the LSx Technical Help Section category; I bought a Moser 9" rear axle housing not M9, would of like to but don't have 3,000 laying around, ...

  1. #1
    Junior Member Octavain's Avatar
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    Torque Arm for Moser 9"

    I bought a Moser 9" rear axle housing not M9, would of like to but don't have 3,000 laying around, and I'm looking for a adjustable torque arm. One that will get ride of some clearence issues I have with the stock torque arm when I go over holes and bumps in and on the rode. The stock torque arm makes contact with the car's bottom side when I go over these pot holes in the road. As anyone else encountered this problem with a new 9"?
    -Aaron
    Mods: SLP Flowpac Cold Air Induction Package, 160 Thermo, TB bypass, SLP (Clutch, Pressure Plate, Flywhell), Skip Shift Elminator, UMI (SFC, Tower Brace, LCA, Torque Arm, Panhand Bar), no cats, Moser 9" w/ 3.89 gears, 5.0 short throw, Strano Springs, Koni single adj, '94 OEM ZR-1 wheels

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    Veteran Hi-Po's Avatar
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    I have this setup with my Moser 9". It works very well.

    http://www.bmrfabrication.com/misc/TCC006.jpg

    http://www.bmrfabrication.com/torque%20arm/TA001.jpg

    Adjustable TQ arm
    Adjustable trans mount.
    370 CI - Twin 6766 Turbo - Jakes stage 5 4L80E - MWC 9" - Holley Dominator

    Build in progress...

  3. #3
    Junior Member Octavain's Avatar
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    Did you run into any problems after installing your Moser 9"? I had to get a longer driveshaft and I had to get a adapter for my rear sway bar to clear the axle housing. And I have that mystery contact noise which I believe is the torque arm.

  4. #4
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by Octavain View Post
    Did you run into any problems after installing your Moser 9"? I had to get a longer driveshaft and I had to get a adapter for my rear sway bar to clear the axle housing. And I have that mystery contact noise which I believe is the torque arm.
    Yea, I had the sway bar clearance issue. There are sway bars that will clear, I didnt feel like spending more money as I alreeady had the upgraded BMR sway bars.

    I have heard of some people having to "clearance" the TQ Arm tunnel, by way of hammer I didnt have any problems at all. I am using a PST driveshaft, to my knowledge, its stock size.

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    Slow'er'Ass Mr. Luos's Avatar
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    Only issue I had was the Moser rear didn't sit in perfect. Needed double adjustable LCA's to straighten it out.
    I used my UMI tunnel braced torque arm with both the 10 bolt and the 9"

  6. #6
    Junior Member Octavain's Avatar
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    Tunnel brace being, where the torque arm still attaches to the tail of the transmission?

  7. #7
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by Octavain View Post
    Tunnel brace being, where the torque arm still attaches to the tail of the transmission?
    Does not attach.
    It replaces the factory cross member under the car.

  8. #8
    Junior Member Octavain's Avatar
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    Could you post a link of where you purchased yours from?

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    Here is my suspension setup with my Moser 9":

    - Spohn Tunnel Mounted Adjustable Torque Arm w/ Driveshaft Loop (had to "massage" the tunnel for it to not bang)
    - BMR 1.25" Xtreme Sway Bar
    - BMR Adjustable Lower Control Arms
    - Edelbrock Adjustable Panhard Rod
    - Eibach Drag Springs (stock height)
    - KYB AGX Shocks

  10. #10
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by Octavain View Post
    Could you post a link of where you purchased yours from?
    I recommend getting UMI stuffs from LMPerformace.com.
    I have talked with Ryan about being a sponsor here, but since LMP sells their stuff, he didn't want to spend the $$.

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    Junior Member Octavain's Avatar
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    What pinion angle did you have set on your F-Body for the torque arm?

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    Quote Originally Posted by Octavain View Post
    What pinion angle did you have set on your F-Body for the torque arm?
    -2 degrees is what my set-up is at.

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    Quote Originally Posted by Mr. Luos View Post
    I recommend getting UMI stuffs from LMPerformace.com.
    I have talked with Ryan about being a sponsor here, but since LMP sells their stuff, he didn't want to spend the $$.

    LOL -- had the same conversation with him and received the same answer.

    +1 on the UMI suspension pieces. Nice stuff.

  14. #14
    Junior Member Octavain's Avatar
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    So I have put in a UMI tunnel brace adjustable torque arm, and have the pinion angle I believe at -5. I have a couple of questions I need help with. First question is going to sound stupid, but how do I know if I have negative or positive pinion angle? Second question is I have this god awful gear noise that comes from the differential when I let off the accelerator for a split second, any ideas???? Last question I've had this weird contact noise when I drive and go over a bump. It's been impossible to replicate the noise when the car is parked. I've tried bouncing/putting a load on the rear of the car to try to duplicate the sound, but I can't. This weird contact noise started after I installed the Moser 9". I also have non-adjustable LCA maybe I need to get adjustable and try to straighten the axle more. Or maybe I just need to take it to a differential specialist!! LOL One last thing that I can come up for a explanation for this weird contact noise is the original 12 year old shocks have pretty much had it. Any help is appreciated.

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    Negative pinion angle means that the differential is "pointing down" in the front. If you drew a line parallel to the road through the middle of your differential, the center point of the yoke would be below this line. The reason for negative pinion angle is that as the car accelerates, the rotational force of the tires against the pavement tries to rotate the axle. To put it in perspective, looking from the left side of the car it tries to rotate the axle clockwise, hence lifting the front up. By setting the pinion angle "negative" it actually results in almost zero pinion angle under acceleration.

  16. #16
    Junior Member Octavain's Avatar
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    Thanks for the help. Does anyone have any solutions to question two or three?

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    Moderator 35th-ANV-SS's Avatar
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    Banging noise could be the Torque Arm hitting the underbody of the car in the tunnel. I had some slight bang until I created clearance on mine with the TA rubbing over bumps. Since then, no issues. Did you set the gears in the differential up yourself? You can expect their to be a little louder whine coming from the 9" in general, but this can be essentuated if not set-up properly

  18. #18
    Junior Member Octavain's Avatar
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    No I didn't set the gears. MAE Racing did that for me. I just put in the third member and ran with it, and of course did the proper break-in procedures.

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