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Any Ideas??

This is a discussion on Any Ideas?? within the General Help forums, part of the LSx Technical Help Section category; I just recently had all BRM lowering springs, lower control arm + the relocation brackets, tranny mount, and on car ...

  1. #1
    Member 01SsRacing's Avatar
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    Angry Any Ideas??

    I just recently had all BRM lowering springs, lower control arm + the relocation brackets, tranny mount, and on car adj pan hard bar one sided rod end link. Im very happy with it all untill I get on the highway, Im getting a crazy vib from the mid to back of the car cant pin point it yet. the vib comes from 70 up and at WOT its real bad, also if I put the car into D not OverDrive its bad also but 1st and 2nd are smooth. If anyone has some ideas or might know something please let me know its driving me crazy!!
    2001 Camaro SS, LM 1, BMR LCA, relocation brackets, BMR springs, adj panhard bar, smooth below, lid, sub-frame connectors weld on, strut brace
    2000 WS6, ls6 intake, sub-frame connectors, slp maf, slp cat delete with slp y-pipe, electric cutout, strut brace, smooth below, slp lid, bmr LCA and RLB

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    Moderator 98TransAmWs-6's Avatar
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    Did you tighten everything down to the correct specs? I would start by rechecking everything. In addition did you load the suspension for the LCAs and relocation brackets?
    1998 Trans Am WS6 - Phantom
    421 CI LQ9, Tick Performance Custom Cam, TFS 255cc LS3 heads, Kooks 2" LT headers, Kooks 3" True Duals w/ high flow cats, FTP 104 lid, Speed Density Tune, 4" silicon tube, LS6 VCT, FAST 102 Intake, NW 102 TB, Oil Catch Can, SLP Bilstein Shocks w/ Vogtland Springs, CTS-V 4-piston Calipers w/C6 Z06 rotors, Stainless Steel Brake Lines, R1 concepts premium rotors, Hawk HP+ brake pads, VFN WSQ Hood, C5-R timing chain, SLP oil pump, E85 tune, Walbro 450 fuel pump, Deatschwerkz 95# injectors, Breathless performance headlights, Frost Tune, !HVAC.
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    Spaz is My Mentor SMWS6TA's Avatar
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    In addiation to what Will stated - check you pinon angle on the yoke. If it is not set to -2* you will have what you're describing.


    Lowering the vehicle will change the yoke pinon alignment.

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    Quote Originally Posted by SMWS6TA View Post
    In addiation to what Will stated - check you pinon angle on the yoke. If it is not set to -2* you will have what you're describing.
    This is what I was going to suggest. Lowering your car with adding that tranny mount has changed your pinion angle and that will destroy your drive train; u-joints and rear end. Hopefully you have an adjustable torque arm and if not, you should invest in one.

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    Member 01SsRacing's Avatar
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    everything was TQ to the derections, also was pre loaded.

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    Member 01SsRacing's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    This is what I was going to suggest. Lowering your car with adding that tranny mount has changed your pinion angle and that will destroy your drive train; u-joints and rear end. Hopefully you have an adjustable torque arm and if not, you should invest in one.
    I do not have a adj TQ arm still the stock one, and it might even be bent some. I dont know what the pinon angle is ill have to get that looked at. In all my reseach I didnt know lowering the car would effect that and JW what would the tranny mount have to do with it?

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    Moderator 35th-ANV-SS's Avatar
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    Your drive shaft comes out of your transmission. If the new mount is offset different (some are 1/8"), it throws the pinion angle off.

    Lowering your car changes your car's suspension geometry - so again, this in addition to the above most likely changed your pinion angle.

    Pinion angle simply refers to the angle of the differential's pinion in relation to the drive shaft. The torque arm controls the rotational degree of your rear end. An adjustable torque arm allows for you to change this setting. Stock setting is around -2 degrees. You can use a magnetic angle finder to measure it.

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    Member 01SsRacing's Avatar
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    Great info, so what do you think should be done first? Check the pinon angle see what its at? and if it off I need to buy the adj TQ arm, and what is a good angle setting for the car?

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    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by 01SsRacing View Post
    Great info, so what do you think should be done first? Check the pinon angle see what its at? and if it off I need to buy the adj TQ arm, and what is a good angle setting for the car?
    I would check the pinion angle before you do anything.

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    Moderator 35th-ANV-SS's Avatar
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    Different setups require different angles. Most range from -1.5 to -2 degrees though.
    It's on jackstands.

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    Member 01SsRacing's Avatar
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    so if it is somewhere within -1.5 and -2 thats not the problem?

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    Moderator 35th-ANV-SS's Avatar
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    I would say no, but I am guessing it won't measure that.

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    Spaz is My Mentor SMWS6TA's Avatar
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    make sure you measure it while the suspension is under load.

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    Member 01SsRacing's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    I would say no, but I am guessing it won't measure that.
    so you think its off then? and the could be my problem?

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    Spaz is My Mentor SMWS6TA's Avatar
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    yes


    You stated that the Torque Arm might even be bent. All that will effect the geometry.

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    Member 01SsRacing's Avatar
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    Thanks guys!!! I hope thats it the vib is driving my crazy, I cant stand it.

    that said any TQ arms you guys like some better than others?

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    Spaz is My Mentor SMWS6TA's Avatar
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    I'm using UMI Performance adjustable Full Length TA.

    Very easy to install and one tough piece.

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    You can't use the one I run.

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    Member 01SsRacing's Avatar
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    I was looking at those and right now I dont have LT's will be getting some it was going to be next but I rather not trash my drive train if this is the prob so Ill get the TQ are next, but some I was looking at were saying will fit with LT's and others for stock, I dont want to buy anything twice cuz I only work part time haha money is tight.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Give UMI a call, their reps are great and very knowledgeable.

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