Another pinion angle ?

Thanks for all the info. I tell you what, there are quite a few different opinions on how to figure this. I have been reading, listening, watching videos, and asking questions for the last couple days to make sure i get this right. The more I do any of that the more confusing it can get.

Some links say to find parallel and measure your angles from there. Mine is +1 on the transand -2 on the pinion. Which then says to get a total of -6 I need to lower my pinion to -7 to achieve 0 under load. If I am understanding correctly. Only one other guy here locally has told me to do i that way. He street races his Nitrous SB Dart and it works.

A couple others state to connect the driveshaft. Measure pinion angle and the rearest point of the driveshaft angle. Add those two together and that is your PA. I.E. PA is -3 and shaft is -3 = -6 total PA. They don't even account for the transmission. Two websites and one local person did this. Person has a 500" BB 727 D60 with 4.30 running low to mid 10s. Proven setup. Its been a few years since he set his up and did say he wasn't a 100% if thats how he did it. So.....

One has told me nothing else matters. Just drop the pinion down to -6 to -7 and run it. He has ran his car this way for 20 years on the street and the track. Small block power auto and runs consistent as hell. Maybe since he is 57 years old it is his old school nature. He has been around the block and had to learn without the resources that I am able to use. Like you guys.

So after all my chatter here and reading what oldkimmer and cope said in detail and basically the exact same way. I think that is how I will figure mine up.

I APPRECIATE EVERYONES INPUT THAT WAS USEFUL. TIME TO GET HER BACK TOGETHER.