[tex_waco_usmc]

My early 04 seems to be shifting to early. It goes into overdrive at 55. Speed limits here in TX are 70 so by the time I hit 70 she is at 2100 RPM. Fuel Mileage has drop to sub 17. This happened after shift kit and two sensors in trans were replaced, trans flushed and bands tightened. Was wondering if someone could tell me what there truck shifts at? BTW, I am running a 410 gear in the rear.

 

[tex_waco_usmc]

sub 17 mpg for 4.10 gears is in the normal range for a 2wdr on winter diesel.
some get better some worse
with the cold winter temps at your location, the local fuel depots are probably dumping 50% #1 mix into the diesel. the stuff has far less energy and mpg

original tranny?
how many miles on it?
get a scan tool or scanner on it and check for transmission slippage.

I am in Texas and well the temperatures are no where near "cold" but the fuel could be different. As a matter of fact fuel mileage did start to decline when the colder temps came in. It is the original tranny, minus the shift kit and sensors, truck has less than 70K on it and there is no slippage had that checked the other day. I am going to chaulk it up to different fuel. Also, can I change those gears? Recommendations/thoughts?

 

[tex_waco_usmc]

What size tires do you have now???

I dont know exactly what size they are but they are stock size for a 2wd dually! I have a friend that is a tranny mechanic and owns his own shop so my labor cost wouldnt be that great. I am wondering if 3.73s wouldnt work better for me as I dont tow too heavy too often!?!?!