Yep... I've never narrowed a rear end myself but want to do one for my Crosley build. My buddy had this one & I wanted it. It hasn't been used recently so I'm gonna clean it up & can't wait to get with the program!
Yep, it will hold the two ends in alignment while welding and also allow you to check to make sure there is no warpage when the welding is done. Cool little tool you got there, Bob.