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  1. Pin_Head

    pinion angles

    If it didn't vibrate before and it does after the longer shackle, chances are that it is a pinion angle problem. You can also check the angles with a magnetic angle finder with the drive shaft off. the calculation is with the shackle 90 degrees to the frame, but it wouldn't change much if it...
  2. Pin_Head

    pinion angles

    The formula is: inverse sine (increase shackle length) / (spring length) for your example and stock 42 inch springs it is: invsin (2/42) = 2.7 degrees.   This is an approximation that assumes that the shackle is 90 degrees, but it is good to less than a degree. HTH
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