Ron's thread, and you know how he hates thread drift........
Surely it must be just incorrect length of drive shafts as suggested by Sandy?
As Sandy points out the sand rail guys have extreme alignment and movement. Be nice to know how they overcome the problem.
With respect to CV's, what's critical about half shaft alignment? Educate me Jac Mac! I hope you're wrong, coz I went for low CoG as the primary factor rather than alignment and mine will plunge about an inch to the trans at ride height!
Cheers