our dually won't work in 5th gear.

What is your question?

One of our friends said it could be a loose bolt and u could tighten it and put a little weld on it and it would straighten it out. Afraid to try without some advice. I know it is geared really low to pull heavy lds. We don't do that but that is what it was built for. I don't know the engine my husband is in the garage.