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Old 07-10-2015, 08:59 PM   #21
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IdahoBoy, I curious as to how you are figuring mpg. When you went to the larger tire, did you have the speedometer recalibrated?
Exactly!

When you increase tire size (taller tire), not only is your speedometer inaccurate, but so is your odometer and the on-board computerized fuel economy calculations. They would show you haven't gone as far as you actually have and the fuel economy calculations would show a lower mpg.
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Old 07-11-2015, 12:54 PM   #22
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Sean, I wondered if the 3.73 gearing would be close to it.


BTW, my TT is a JayFlight 24FBS. I think GVW is 7200 lbs.

Poppy if you wish to know exactly what you have for a final gear ratio.. put the rear end of the truck up on axle stands, transfer case in N mark your tires at the 6 o'clock position and the drive shaft the same way... then start turning the driveshaft count how many full revolutions the driveshaft does to on rev of the wheels.. that is your new ratio..

On another note have you made sure your trailer is still level towing.. if its tipped up it is putting too much stress on the rear trailer axle.
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Old 07-11-2015, 04:26 PM   #23
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Sean, I was pleasantly surprised that the trailer hooked up level without having to readjust the hitch, and I had no problem pulling on the last camp trip.
I think I'm just going to stay with a guess as far as final gear ratio. Not that big a deal anymore since I've got some idea what's going on. But, thank you for your help.
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