What kind of mileage w/ HO/48RE and 4.10s?

[rmcnamee]

What kind of mileage and highway (70-75 mph) rpms can I expect with my soon to be delivered 2003 3500 QC, Short bed HO/48RE, 4x4? Will the rpms lower significantly if I install 35" tires?



Thanks

Ryan

 

[BOMB Squad]

I've been averaging a pretty consistent 15-15. 5 mpg (hand calculated). I went with the 4. 10s with 315/70R17s in mind. I hope to see an increase in mpg with them installed.

 

[rmcnamee]

Thanks Bomb Squad for the reply. What are the RPMs on the highway? Post some pics when you get the 315s installed.



Ryan

 

[Steve M]

47RE and 48RE have the same ratios. 70 mph is about 2250rpm with stock 265-70R17s. Here's the formula to play with.

MPH X axle ratio X O/D X 336 / tire diameter= rpm

In my case,

70 X 4. 10 X . 69 X 336 / 30" = 2217rpm

Remember that advertised tire diameter isn't always accurate. Loaded tire diameter will be less.