My 2005 F-150 4x4 started slipping going in reverse. As of right now, it will only slip if you give it some gas, but it is progressively getting worse. I have taken it to a tranny shop and they think that it is probably the bands. If so, are these something that can be tightened (on this year) or better to replace? My baby only has 93k miles on it. If I am going to be in there anyways, should I look at replacing anything else if I am not having any other issues? Thanks!