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Z Height Specs GMT-400,800,&900

Discussion in 'Chevy Trucks' started by NICHOLS LANDSCA, Jan 6, 2012.

  1. NICHOLS LANDSCA

    NICHOLS LANDSCA PlowSite Veteran
    Messages: 4,302

    Thought I'd post this because there seems to be torsion bar question almost daily.
    Steps for measuring acccording to GM:

    1: Jounce the front suspension of the vehicle by pushing the vehicle down and lifting up.

    2: Allow the vehicle to settle and take a measurement.

    3: Set the top edge of the level on the reference surface of the steering knuckle and extend the level directly under the front end of the front attachment bolt of the lower control arm.

    4: While keeping the level in contact with the knuckle reference surface, adjust the level up/down until the bubble indicates it is horizontally level.

    5: Measure the distance between the center of the bolt and the top of the level for your first measurement.

    6: Keep the top edge of the level on the reference surface of the steering knuckle and move the level directly under the rear end of the rear attachment bolt of the lower control arm.

    7: Measure the distance between the center of the bolt and the top of the level for your second measurement.

    8: Average the measurements between the step 6 and step 8.

    9: Record the measurement.

    Any aftermarket modifications could affect the results of the numbers also. The very bottom of the steering knuckle should be the base refrence point for the measurements.


    These specs are for 4X4

    GMT-400
    1/2-3/4ton 157mm/6.18in, +/-6mm/.23in
    1ton 145mm/5.70in, +/-6mm/.23in

    GMT-800/900
    Spec is 4.3-4.8" 4.5" is optimal
    Cab and Chassis spec 3.9-4.4" 4.2" is optimal
     
    Last edited: Jan 6, 2012
  2. SMiller

    SMiller Member
    from IN
    Messages: 46

    I don't think one single person actually raises the T-bars that way.