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David:
I agree, concur, and second all the cautionary comments. Make sure you completely understand the necessary engineering.
I’d like to dwell on the differential. Our coaches are a single screw. You’re going to be putting a significant amount of torque and horsepower through that single differential. Possibly more than it was designed for. I would try to locate the manufacturer and determine if synthetic lube can be run in it and get the best synthetic you can find.
I would also install a differential temp gauge. Whatever diff lube you use, know its operating range and stay within that; which might limit your cruising speed and add challenges climbing long grades.
I would also consider replacing the axles. Unless you’ve owned the coach from new, you don’t know if a previous owner has abused the differential or axles. Last year a friend had an axle on his Prevost break. It was a very expensive experience which entailed a tow, complete breakdown of the differential and hubs to thoroughly clean everything out. I had an axle in the race car’s Ford 9″ break once and it took us hours before the mechanic was satisfied everything was clean enough.
Keep us posted as to what you do.