there's an 1982 version of that book on ebay. would a later version have updated info or should I grab that one? thank you for your time. there's a bunch of utube vids on pinion angle, (some are excellent, some are not) that helped me grasp this. As RRR said it is the "working angle" of both ujoints that you want to be correct. iirc you want them to be parallel but in different planes (1 up/1 down) & that is not from the ground but from each other & anywhere from .5 degree to 3 degrees & within 1 degree of each other then the pinion a bit further down (toward the ground) from that for pinion rise (depending on the suspension type/racing your doing).