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Thread: Turbo 4x4 1500 launches violently

  1. #1

    Turbo 4x4 1500 launches violently

    I made a few runs this past friday night at the local 1/8th mile track... I have 325/65R18 (33x13.50) nitto's on 18" rockstars. I have the front end leveled with torsion keys. I can't apply any power whatsoever in 4wd or the front reacts violently, by picking up the front of the truck until it tops out on the shocks and creating serious positive camber and toe in and jerking left and right multiple times. 4x4 launches at only 2psi and 2500rpm are impossible and 2wd launches are worthless in a truck.... What needs to be done to allow a 4x4 launch like i see some of these trucks doing? I remember parish's truck used to launch in 4wd.... If its because of my torsion keys i will gladly remove the wheels and tires and lower it back to stock height or even lower... i did an inspection of everything... it all looks great and no bent or broken parts....
    2005 silverado ECSB 4x4 1500
    -2005 1500 Z71 ECSB 6.0 swap, Cooks Racing 4L80E, NP261HD, Carolina Driveline 5" shaft, CST Tie-Rods, front mount 76mm, Livernois hot pipes, Circle-D 258mm (~3500), Mallory 2-step, 100 Dry shot, 750CC RC Eng. Inj, Nelson Tuned, 4.10's, all through a STOCK 10-bolt

  2. #2
    Join Date
    Dec 2007
    Location
    Maui, HI
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    571
    Id say drop it a little so it has that stink bug stance then go from there.
    Last edited by Maui4x4; 09-07-2010 at 05:55 PM.
    99 Silverado 1500 4x4 RC 4.8
    4L60E, 3.73, Homemade CAI, 92oct Quik tuned,
    08 Tahoe radiator/fans, Dumped exhaust... summed up one loud pig caller |[226K! on odometer|

  3. #3
    Join Date
    Mar 2007
    Location
    Newark, Delaware
    Posts
    931
    Put some limiting chains or straps on the front end to reduce suspension down-travel.
    Big slow mud truck with a TUNE!!!!!!

  4. #4
    Join Date
    Jun 2008
    Location
    Houston
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    2,348
    you need to drop the crap out of the front, lower it untill the CV's are AT LEAST level if not lower, it will help plant them alot better
    74 Austin Morris Mini 1000 - Daily Coil Spring conversion, lowered, Disc Brake conversion
    FOR SALE: 04 RC/LB Duramax -12 second tow pig, built Allison, Tune, and supporting mods
    FOR SALE: 03 Silverado SS -DBRods built 40X, DP, Suspension. Going for fast

  5. #5
    Join Date
    Mar 2010
    Location
    Tuscaloosa, AL
    Posts
    256
    I have a very similiar issue, 4wd launches are scary as shit and I cant steer worth a damn.

  6. #6
    Join Date
    Sep 2005
    Location
    Austin Tx.
    Posts
    13,138
    foggy also had this issue and I believe he resolved it. Check with him he was on 6" and 33 or 35s
    1951 3100
    1984 C10

  7. #7
    Join Date
    Mar 2007
    Location
    Newark, Delaware
    Posts
    931
    I also suggest getting tie rod sleeves and maybe the cognito pitman/idler arm braces.

    http://www.merchant-automotive.com/s...odsleeves.aspx

    I'm also trying to remedy this issue. The limiting chains helped, but I think I need to play with their length more to get them to work better.
    Big slow mud truck with a TUNE!!!!!!

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