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Old 12-03-2019, 08:55 AM
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Half-Inch Stud Half-Inch Stud is offline
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Join Date: Jul 2000
Location: BlueBell, PA or AL U.S.A.
Posts: 18,457
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I have fixed rear arms.

Just looking underneath at normal stance, the pinion ought be SLIGHTLY below level for Street-Strip, maybe at level for Street.

Then (when nobody is around to bother ya) floor-jack the pinion and see how the pinion attitude doesn't change. Only the rear system rises.

Then consider the front end height when running the 1/4 mile. Set the front end with blocks under the Engine cradle, and redo the pinion raise with floor jack. I think a Urethane bushed rear system will barely show a change in pinion angle. You just might have the correct angle as-is. I sure do, with stock arms, boxed lowers, and the Straps for frame stiffning.

Fun fact: in the 1980s i has a 68 GTO Street car where the upper Arm Frame Crossmember mount holes had 3-holes per side. Had to be factory piercings: it was too neat. Thought that some engine option caused that. Never saw such a pinion-angle selection again.