If it is the POWERSTROKE 7.3L, you may have a wiring nightmare, as I've never done this type of swap, but I suppose you could change the entire harness from one to the other
The diesel hooked to a auto isn't all that spectacular for fuel mileage. I have the old "mechanical" 7.3 in a 3/4 ton 4x4.. Not sure of gear ratio and all but if I get 10 mpg, I'm on a roll.. But it is the old 3-speed auto, so a 4 speed would help some.. My truck also weighs in at about 10k with the fuel tank filled, welder, air compressor, tools, etc.. But.. My company truck is a 6.0 with the 6-speed manual.. it has a utility box (that's loaded down) and 99% of the time is hauling 100 gallons of fuel, so I'm guessing the weight is close.. and I'd have to check my mileage records, but I'm thinking I get about 20 mpg out of that.
You would probably have to change the core support and for sure the radiator in your truck.. the gas radiators are nowhere near the size of the diesel. (the one in mine is 42x38 inches if I recall correctly, and I'd guess close to 100 pounds)
I'm not gonna tell you to do it or not do it, as you know how much you're willing to tackle.. My suggestion would be to use the ambulance as it is around the farm, or cut off the box, weld in a back wall and slap a good ol' flatbed on it.. Or maybe you could change some body mounts and set the truck cab on the ambulance frame.. those would be more feasible ways to do it I think..
If you do go through with the swap, as I said, I'm no expert, but I've done some swapping myself, and have some experience with both the old Mechanical 6.9 and 7.3's, and some with the Powerstroke 7.3's.. and a service book or 2 and would be willing to assist in any way I can
Brad
OH and the 7.3 weight is approximately 750 pounds
This post was edited by Brad Gyde at 18:22:56 05/12/10.
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