Hmmm I didn't think about that but that would have worked great if I done that on my old axle so I knew how far it moved before I took it out and put new one on. But I'll do it anyway to see if it moves or if it gets crushed, that'll be a bad sign so hopefully that doesn't happen but if it does I'll know I need to fix something somewhere before something bad occurs.

And btw what would happen if my driveshaft bottomed out on the splines of the yoke?

Im guessing it would send a shock toward the front into trans and then into engine like dominos correct..... Or would it put force on my trans/motor mounts? Or both I suppose.... Hopefully I'm ok on this issue. but I'll for surely keep a close eye on this issue.