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I think you are right about the testing having been done under full load.
Anyway, as you said before let's build on tested ideas.
My rear end is a 3.73 but so is the front... its a 4wd remember? All Dana heavy duty stuff. My transmission 6th gear is 0.73 ratio. I had investigated swapping to a different gear but doing both differentials was costly and low ratio gears is not a good idea for pulling. No problem for the engine but not good for the differentials and tranny. The gear vendor additional 6 gears sounds like a better engineered solution to retain pulling power but lower rpm matched to the weight.
One thing I find surprising in Gear Vendor instructions is that oil needs to be changed every 5000 miles! Doesn't make any sense to me. Transmissions can go 100,000 miles without renewing fluids although I do mine every 20,000. How often to you change oil in your gear vendor?
If the only change I make from my current set up is the GV overdrive, so I keep my tranny 0.73 gear and 3.73 diff ratio, can I expect something like 10% highway mileage improvement at the same 60 mph?
Thanks for all the help.
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