I think I have the driveline lined up much better than it was before I installed the Trail-Tailor adjustable rear control arms. Since it made such a noticeable improvement. I would like to check it get it as close to perfect as possible. Does anyone have recommendations for a tool and measurements?
I see there is a phone app now for this.
www.superchevy.com
And a traditional pinion angle measurement tool.
www.lightningrodder.com
I see there is a phone app now for this.

How To Use Tremec's Driveline Angle Finder App - Get Your Angle On
Stock is not a word used very often in the performance industry. LS engine swaps, transmission changes, beefy rear axles, major suspension mods, and ride height
And a traditional pinion angle measurement tool.

How to Measure Driveline/Pinion Angle
Driveline Angle Inspection Special Tool(s) Anglemaster II Driveline Inclinometer 164-R2402 or equivalent NOTE: An incorrect driveline angle can cause a vibration or shudder. For additional information, refer to Section 100-04 . 1. Check the vehicle for evidence of overload or sagging...