pinion angle

I just set mine a few months ago. I called cal trac and this is what they told me. I had them dummy it up for me.

1.) the car has to be on its tires in full driving weight.
2.) find the degree of slope on the engine and trans. I measured off the front of the harmonic balancer. my engine tilled down in the rear 2*
3.) they told me that i needed to anticipate 3-5* of rotation upward on the pinion snout under load.
4.) you want your engine/trans center line to run paralled with the differental yoke center line under full load.
5.) so i set my rear diff angle upward @ 2* then subtracted the 3-5* ( i chose 4*) so it was set at 2* down.

every car is different, but the pinion angle relates to the angle of the engine and trans.