Gear ratio

[8.1Lgmc]

I think the 4.10's run the engine at optimal RPMs at highway speeds. I put taller tires on my 4.10 8.1L truck and had to run 72 mph to get rpm's where I got better fuel mileage. I get my best highway mileage at right around 2100 rpm.

[Alf1993]

Have an 03 1500 HD and the previous owner told me I it had 4.10s but my rpo code says the truck is equipped with 3.73s but is it possible that the previous owner had the dealer install 4.10s

[nekkidhillbilly]

my 07 1 ton has 373s it does real good though

[Adam Bates]

On 6/18/2013 at 4:42 PM, Chris said:

GU4-3.08

 

GU5-3.23

 

GU6-3.42

 

GT4-3.73

 

GT5-4.10

 

[Adam Bates]

IGCE what gear ratio is that. It's a 05 Chevy Silverado 4 door 1500  

[Raptordude]

I dare suggest that in areas such as Tennessee where we have rolling hills that 4.10's would probably yield better gas mileage. My 3.42 truck is constantly downshifting, even on interstate.

I agree. While the 4.10s may not be as good on the highway unloaded, out in the country of PA where I live, they do better than 3.73s. My truck UPSHIFTS up hills rather than downshift. I can pull any hill I want in 4th gear lockup unloaded


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[Yuuuup]

I have a 2005, 2500HD 6.6 with 40’s  410 ok for the city/ Country? Springfield, Oregon.