mixed info on setting pinion angle?

Ok again, I need people to understand my issue is not going forward, just getting started in reverse. Going back to the beginning. After the tranny conversion I almost could not go in reverse at all due to the HARD thud the car made...................The thought of a broken tooth has crossed my mine and is my last resort.

OK, I see

FORGET pinion angle. You need to pull the shaft and inspect the U joints carefully, then pull the axle apart. Pay attention to the brakes and axle bearings, IE each piece as you tear it down.