Here's a great video showing why equal working angles are more important than just "pinion angle" that comes up so often.
http://www.macsmotorcitygarage.com/2014/07/26/video-driveshaft-angle-and-phasing/
Derek Kiefer - Mantorville, MN
69 Malibu Pro-Touring stroker LS1-383/T56 - 69 SS396-325/3spd project