Triton V8 vs. Triton V10?
Its seems that what you need is the v10 with 3.73 rears but be forwarned that this superduty series is not an economy champ when it comes to everyday commuting. If your trying to replace your older truck with something that gets the better mileage take your time to make your decision. Especially with the possibility of rising gas prices and unstability in the mid east.
Good luck!