I saw a trans a couple of months ago that was built but a builder on the forumns here and it had lost reverse. I pulled it apart and the band was toast. I wanted to make sure to catch the problem so it would not happen again. I looked and looked and chalked it up to driver error. I took one more look and there was a extremely fine hairline crack on the low-reverse piston. Replaced it no more problems. Moral of the story is, you never know what going to happen, or what you are going to get, or if it happened after you got the trans. Just need to pull it apart and see. One other thing, i was going to mention to tighten the band if it is loose, but if the lining is almost all the way gone, you can tighten it, but if you do you will probably have reverse for a while, but you might ruin the low-reverse hub, so take it for what its worth. It might also be ruined now.