By installing the zero rates it stretched my drive shaft out further than I liked (3 1/4" compression left and only 3/4" extension). I used a longer drive shaft slip yoke (longer by 1 3/8") and it put everything back to normal with 2" extension and compression available for the shaft. The longer slip yoke was cheaper than lengthening the shaft. Hind sight, I bought the yoke first, when I went to get the u joints pressed the shaft was dented and bent so it was replaced anyway and could of just been lengthened. I had no felt vibrations from the drive shaft previously.
Before:
After:
