John, Good post.
Yes, I bought a 3.55:1 center section fronm a friend about three years ago, and installed it. No twist then. I haven't put but MAYBE 2,000 miles on the car since then. I bought a 4.10 S-G for it the other day and when I swap those third members, I'll be giving it a real once-over for any evidence of twist. You're surely right about it not helping much to have the spares with me if it breaks in the axle spline area.I've got a 1972 Fender Mustang bass that I never use (have a Precision I like better), that is like new. Maybe it's headed for E-Bay.... lol! I might be able to get enough for it to pay for a set of Mosers.... we'll see.
Thanks a lot for your concern and your good advice!
Bill, in Conway, Arkansas