Easiest way is to draw two lines on the paper one with the engine pointing down the other with rear pointing up so both lines are parallel to one another under load.So
if the engine is -3 which most gm's are, the rear needs to be +3 to be at zero pinion angle, then u adjust from there to compensate for the amount of pinion wrap up,
obviously leaf spring cars need more, then a 4 link or ladder bar car. If leafs, put the rear at -2 that would be 5 degrees of pinion angle
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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74
2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial
2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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