I'm in the process of purchasing a 1993 F-250 7.3 IDI non-turbo, 3:55 gears, extended cab, 112,400 miles on it. Seller's had it for 3 years, only put 1,000 miles on it since then. He bought it for the heavy camper that came with it and prefers his Duramax truck. Previous owner used it for...