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Street Race Truck More... The Toolbox

Quick Change R&P Ratio Without Opening Up the Rear

6/22/2018

Common question: Can I determine my Quick Change R&P ratio without opening up the rear?

Answer : Yes.

  1. Elevate the car (engine off).

  2. Remove quick change gears.

  3. Chalk mark the tire at the 12 o’clock position.

  4. Chalk mark the pinion at the 12 o’clock position.

  5. Rotate the tire by hand 1 complete revolution.

  6. Count pinion rotation as tire is rotated.

  • Just past 4 revolutions = 4.11 or 4.12 ring and pinion

  • 4 – ½ revolutions = 4.57

  • Almost 5 revolutions = 4.86

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