To the OP: Go for it. The V10 is one of the best engines, running on gasoline, that has ever been mass produced. Smooth running, like an electric motor. If the Excursion you are looking at is at a dealer, make the deal with new spark plugs included. The 4:30 is a better choice, but, finding an Ex with this rear ratio is not likely. The overdrive ratio of the transmission is approx. .78. When in OD, the math is 3.73 X .78= 2.91 effective ratio..! Pretty tall gear..! I have owned 3 diesels and 2 V10s. LOVE the V10. Very sad that Ford does not use the V10 in the 250 and 350 any more.