I think it may be a case of I have all the info I need but I just dont know what to do with it for some reason! So I was curious how my drive line angles were after having to get my drive shaft shortened. I bought a digital angle finder and set about getting some numbers. I got off the tail shaft of the transmission 2.7 degrees going down, driveshaft is 1.8 degrees down and the pinion yoke is 1.0 degree up. I plug them into the spicer angle finder https://spicerparts.com/calculators/driveline-operating-angle-calculator ( which I assume is finding U Joint angles) and get an operating angle of 0.9 at the transmission and 2.8 at the yoke. Admittedly this is where i think i start to mess up. The car is not stock 70 now so I'm looking at the 71 service manual for a skylark coupe because the rear is a 71 but it still has the TH350 for a transmission so I figure these numbers are correct not the GS ones (since I believe GS refers to GS 455 because that's how it is in the 70 manual). It tells me to have 2 3/4 for the front and 1 3/4 for the rear. Should I use the book numbers for spec or is there a general rule that works regardless of combo types? How would i start to bring these numbers into spec? Trans lowered or raised ? Do coil spring rears even have some amount of adjustment? I don't doubt some of you guys that have raced or restored see those numbers and instantly know whats up. I honestly have never done this type of work before and feel I am going in the right direction but I still feel a little fuzzy on the whole thing. I'm curious how an experience person would start to tackle it so I can learn the right way.