I bought an F-550 last year with the 7.3L gas engine, 10 speed, but 4.88 gears. We put 5 tons on it every day and it pulls fine. The diesel is $10K more and then you have all of the headaches of all of the exhaust BS. Plus the diesels cost more to fix in the long run. Enjoy.

"Government is not the solution to our problem, government is the problem."
Ronald Reagan