I know this subject is all to common but there is something I'm not sure about that I could use some help with. Just pulled the 12 bolt out of my 87 blazer and I am putting in a 14 bolt ff from an 86 k-30. I cut the perches off and loosly bolted the diff in with all weight on the diff in order to get springs loaded to measure pinion angle. My transfer and pinion are perfect but it and looks to be close to the old marks(where perches were previously mounted) but when I put an angle finder on the driveshaft the angle is right at 30 degrees downward. The only changes I made during the axle swap was pulling the 6" skyjacker blocks and installing 6" skyjacker springs. Axle angle was much less with the 12 bolt with no vibrations. Any ideas? Am I doing something wrong? ps. can't afford a cv after purchasing the 1 tons for know so what do I do with this setup?