Need help adjusting my pinion angle

oldVOR

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It's not totally about the relationship to the driveshaft.
With the vehicle on a level surface, measure the angle of the transmission output shaft. Then measure the angle of the pinion. Both in relation to terra firma. With a full poly suspension, you want the pinion to be nose down in relation to the transmission by 1-1.5 degrees. This allows for axle windup and for the pinion to always be nose down or even with the transmission output shaft on hard acceleration.
 

Pentalab

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On the 4.6 Tech site, (S197) there is a STICKY on pinion angles.
 

46addict

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Did zero work? I know this post has been buried for a while but it's relevant to my situation. My 2piece stock DS is showing -4 at rear portion. My pinion flange is showing +4. I don't want to touch it until I figure out the math. Because I'm figuring a -4-4=-8, or 4--4=8 either way is bad. A minus minus is a positive or has common core jacked us up? Which way do I adjust UCA?

According to the Tremec driveline app and the Spicer calculator, there are three angles to take into account so taking the difference between DS angle and pinion flange angle is only part of the story.

http://spicerparts.com/calculators/driveline-operating-angle-calculator
 

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