I test drove a 2011 F350 CC LB 4x4 with the 4.30 electronic locker a few months ago.It was an awesome truck! Your salesman is trying to get you to buy a diesel. The only reason I didnt buy the one I looked at was my truck will be paid off in a few months and I don't need a $45-50,000 truck payment with a new baby. I say go for it!