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Welcome drivaaaaaa!!!!!

 

265 inches is short. My short hood pete is almost that and it turns cirles around any shaker. then again KW's turning radius sucks.
the 3.70 are low (numericly high) especially for a 10 speed. your fuel mileage is gona suck with that 10 speed and a cat. cats like to stay in a very narrow power band and you have to rev the pizz out of them to shift a 10.

I am getting 4mpg so don't feel too bad.

 

Depending on what 10'spd you have it may have the same final gear ratio as a 13 spd. If so it won't do much if anything for your mpg's. It might be better to look into a new set of gears for the rears instead.
What trans and tires do you have and I can crunch numbers for you with different trans and rears.

 

Wade, I'm curious what that W9 will give ya in MPG with that hood and drive train. Mines got a 500 CAT w 3.55s and I get 5.6 - 6.3, but I'm almost always at 78,000+. I doubt your hood will hinder mpg thaaat much. Not as much as not having a bird banger above the sleeper, which I wish I had at times. I bet if you're relatively light, and drive it right, you'll get over 6 mpg, even with 3.70s.

WTF was this thing neutered to 415 hp for?

 

It's not really a matter of final drive ratio. it's more to do with needing to wind that cat out all the time to catch the next gear.

with that 415hp he's gona need those gears or more.. I'd send it in for a HP boost myself.

my 359 has 3.73 gears and with LP24.5's rubber and a 13speed I am cruising 70 at 1500 rpm. wich is way too low for my big cam but just about right for his cat

 

Not as familiar with the Big Kitty's and what the "sweet spot" would be on her or how hard it needs to be wound.

MM if you want to get rid of the 24's for some 22.5's let me know. 1500rpm is "too low" for the BC? Where do they like to be?

WADE= Yes there are different versions of tranny's. IE- Eaton 10spd has 117 different models. 13spd has 16 models and 18spd has 26.
Although there really are only about 4 different final gear ratio's. Low on the passenger side tranny is an ID plate. Or call the dealer to run your VIN and give you specifics on your truck.

 

22.5's look gay on a pete.

the big cams like to run 1600 to 1900 rpm. Drive it like you stole it driver!! they will get there best fuel milage about 1700 cruising. below 1500 it just falls flat on it's face. I run 12th gear all the time unless empty,very light or hauling ###