pinion angle

When the MP suspension manual talks about "nose down" it is not speaking relative to the ground. It means nose down in relation to the drive shaft angle. What is actually being measured is the u joint "working angle" which is the difference between the drive shaft angle and pinion angle. As usual, Mopar makes it easier to understand. Much in the same way they made camshaft degreeing much easier using their 180* degree wheel. If you have a copy of the MP suspension manual, it is all there. If not, I highly recommend it. The ninth edition is the latest print. Mancini's regularly runs them on sale for 10 dollars. Very good deal.

Oh and the only tool you need for measurement is a four dollar angle finder.

http://www.harborfreight.com/dial-gauge-angle-finder-34214.html