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Pinion Angle and Shock Changes

Discussion in 'Race car chassis tech' started by Robert Rennick, Apr 20, 2003.

  1. Robert Rennick

    Robert Rennick Well-Known Member

    I have recently gone to considerable time and expense getting my pinion angle properly set up. Question: I have air shocks in the rear (Don't ask), if I change to conventional shocks, and the ride height is altered one way or the other, does this mean I have to get my pinion angle adjusted.

    Probably a better question would be, could the pinion angle get thrown out of wack by raising or lowering ride height with the current shocks or by installing new ones. Isn't pinion angle immune to such changes?

    I appreciate the help.

    RHR
     
    Robert Rennick, Apr 20, 2003
    #1
  2. redbuick

    redbuick Well-Known Member

    Yes, ride height affects pinion angle.
     
    redbuick, Apr 20, 2003
    #2
  3. Jim Weise

    Jim Weise EFI/DIS 482

    Robert,

    To understand the dynamic here, remember that the engine/trans heights are controlled by the body, and that the rear end height in relation to that point is controled at rest by, and will vary with different springs rear springs, or in the case of air shocks, whatever else your using to hold the weight of the rear of the car up.

    And distance change in ride height or the relative height of the frame vs the axle centerline at ride height, will in fact alter pinion angle to some extent.

    Changing the rear ride height of the car will have the greatest effect, but any change in the front ride height will also change the realtive angle of the driveshaft to the pinion yoke.

    Now here is the easy answer.. if the car's front and rear ride height are the same as with the air shocks, then no, nothing will need to be adjusted.

    JW
     
    Jim Weise, Apr 20, 2003
    #3

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