Driveshaft: how much clearance?

Also, consider the application. What are you doing with the car? Look up critical speed for driceshafts. For my Charger, due to length and RPM, I need to go to 4" aluminum in order to be in the safety range. Too many people do not consider intended use changes everything.

Mine is from PST. 1350 yokes from Cass at Dr Diff