It seems pretty obvious that the guys running factory drive lines with minor mods will only need to worry about the pinion end. More modified to off the wall combos where the engine/trans angle has changed, or the rear axle height has been changed a lot, then It would be important to look at both ends. A Pro car or well built chassis is for the most part would be set with the trans pointing at the pinion( I would assume?) so just going off the driveshaft to pinion would work well. There is a fairly wide range you can get away with on pinion angle, my guess is 3 to 4 degrees either side of correct at full power. That thought comes from the way SS springs are set, and how far off they are when not under power.
This is my interpretation of why there is so much argument over which way is right.

Last edited by gregsdart; 05/13/15 12:23 AM.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky