Vibration right off idle

Ok, but if the trans angle doesn't allow that then what?

I thought the bottom line was the trans and pinion need to be parallel? Trans -2.5 and pinion +2.5 ( those would be parallel)

Then roll the pinion down 2*.

I emailed Cass the same thread and he agreed with me, so I'm confused.
You are lost
Listen
The trans output shaft MUST POINT UP or positive
The rear end pinion yoke MUST POINT DOWN or negative
This is not rocket surgery you are over thinking this.