Originally Posted By DoctorDiff
If the transmission and pinion centerlines are parallel, the pinion angle in relation to the transmission is zero, not 6 degrees positive.


I will agree with that. However, the difference between the driveshaft and pinion centerlines, which is what my definition of "pinion angle" is, is 6 degrees. If the d-shaft is running uphill 3 degrees and the pinion is pointed up 3 degrees, that's 6. The actual numbers would depend on height difference between the front and rear joints and the length of the d-shaft.

If the results don't match the theory, change the theory.