8 3/4" for the Duster

An 8 degree negative perch angle will bind the U-joints.

If you want to duplicate the stock A-body pinion angle, weld the perches at 43" on center. The pinion should angle upward 5 degrees when the perches are level with the ground.

Thanks, I swore I read it should be angled down (maybe that was for maximum traction drag racing). Thanks. I have and order in your cart for reseal kits, brake lines and brake hardware once I go out and measure for the correct lines!