Your not going to gain much with a two speed axle other than hill pulling power. Most all two speed truck axles have low gearing which will require you to run big tires to get the overall ratio anywhere close to what you have now. Does the RV have wheel wells big enough to allow tires several inches taller to fit, then you'll need taller front tires to level out the rig as well.
The thing that would help you the most is a lockup convertor, but they only came in OD transmissions and you'r gearing is to high for a OD trans.
That rig should have a Turbo 400 trans, the OD version of a Turbo 400 is the 4L80E. A good 4L80E with stand along controller and regeared axle will cost thousands.
A 700R4 and it's replacement the 4L60E are light weight car and 1/2 ton pickup transmissions, they are short lived in heavy rigs or towing.
My advice is to leave it alone and enjoy it, you never save enough in fuel cost to justify the price of the conversion, if you plan to tow with it you need to upgrade to a more powerful RV, that 350 engine is going to be over worked.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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