i'm just wondering & am a bit confused on all these angles. i'm trying to figure out my shackle, pinion, t-case, and spring perch angles. i've done some light searching but haven't found anything that's really comprehensive. i'm trying to figure out the shackle angles for my 52/64" swaps on my '72 K5 that won't have any weight since the body is still removed. also what should the pinion angles be in relation to the t-case? and should i relocate the spring perches on my D70 to get the pinion to point in a better angle? just a bit confused on this subject. thanks.