Re: Drive line clearance
Broomstick is actually pretty darn clever.
You are going to need to position the rear axle in full jounce (max upward travel), as defined by the jounce bumpers or whatever limits the amount of squat. Add the radius of the driveshaft (half the diameter of the shaft) to the centerline created by the broomstick; I'd add 1" to that for a clearance envelope between the shaft and crossmember. You could use styrofoam or that florist foam to mock this up. That should tell you where you want to be.
Unfortunately, based on what I imagine I am seeing in the photos - I think you are going to be doing some rework to that crossmember to provide the necessary clearance.
K
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