A 700R4 is about the poorest choice you could make. It is simply too weak for the weight and profile of the vehicle. A 4L80E would be a better choice, but you will be getting into some money there. Even if you get a core transmission from a salvage yard, have it reconditioned, and get the controller to operate it, you will spend a lot of money. Not hundreds, but thousands. Anything with more gears will get even more expensive - like an Allison. And, the end result may not be satisfactory. Spend a ton of money, get about the same fuel economy, and be totally disappointed in the bargain. Keep in mind that a vehicle with a large frontal area like an RV will benefit more from driving slower than it ever will with changing the transmission. Also note that a 5.7 liter engine is a bit marginal for an 8000 pound vehicle. It might turn out to be afraid of hills.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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