Diesel Truck Question

[phatdaddy]

It's a gas5.9. It's been a geat truck and done everything I've ask it to do. I've pulled tractors and ditch witch trenchers with it . I had to replace the tranny at 120,000. I think that is a common problem.
I know the f350 would be overkill, but I thought if i could get a diesel dually w/ 70,000 original old man pulled a travel trailer miles for a good price, I might consider it. We haven't talked price yet, but I was thinking in the $3500 range.