I built a spreadsheet to figure out what our drive ratios would be after re-gearing the rear end and installing the gearvendors. I'll try to sum it up as best I can...
The old: 4.63 rear meant a drive ratio of 4.63 as 3rd gear is a one to one ratio. Overdrive resulted in a final drive ratio of 3.47:1 so there is some savings as mileage goes. At 55 mph we will be doing 2261 rpm.
The new: A 5.13 means a 5.13 third, 4.00 3rd over (gearvendors on), 3.85 stock gm overdrive, and 3.03 double overdrive (gv on in overdrive). at 55 mph we will be doing 1896 rpm.
The reality: we overrode the double overdrive lockout on the gearvendors but must be careful in using it. The rule of thumb is if you can't accelerate in the gear you're in you better shift down. The only time we use this is when we're going down a grade or have the wind at our backs. I've gotten 8 mpg on occasions which isn't bad for 22,000 pounds of motor home and jeep on a gasoline motor.
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My wife and I dry camp a lot and have developed many ways to save our water, re-use gray water, keep our batteries up, etc...and all of this while out for 5 to 7 days with three kids. Our motor home has 45 gallon capacities of gray and black and 60 gallons fresh water. We've heavily modified the whole system to our needs and wants. How does all of this dry camping sound and not ever have to run the generator, fill up the water, or drain the tanks?
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