3.73 vs 4.10 gear ratio which would get better fuel mileage?

[94yj]

this would be for a 20 to 23 2500hd 6.6 gas reg cab truck TIA

Edited August 30 by 94yj

[Brad Styan]

3.73 NO LOAD 4.10 LOADED

[redwngr]

2023 2500 factory offerings.  (retail and fleet versions)

Of course you can change diff ratios, but 4.10 wasn't offered in 2023

I don't know for sure, but 20 - 22 likely they same.  4:10 may have been last offered with the 6.0 -- 2019 and earlier

 

2023

 

 

 

 

2019

Dmax and 6.0 both had speed transmissions.

[newdude]

3 hours ago, 94yj said:

this would be for a 20 to 23 2500hd 6.6 gas reg cab truck TIA

 

 

3.73 because that is all they offer now with the 6.6. gas 2020-curent.  Transmission changed from the 6L90 to the 10L1000 for 2024, and the 10 speed/3.73 combo is great. 

 

Can't get 4.10s anymore though from factory.  Diesel is 3.42 only.    

Edited August 30 by newdude

[Epsilon Plus]

I think GM dropped the ratio down on the gas trucks because they figured the extra torque of the 6.6 could make up for the drop while trying as they might to not get the worst MPG of any modem vehicle on the road . I average 11.5 city on 37s. Pretty sure if I had 4.10s and especially these new canned tunes coming out with 50+more torque on 91 octane I'd be rivaling the fuel mileage of an LS-6 Chevelle.

[garagerog]

15 minutes ago, Epsilon Plus said:

I'd be rivaling the fuel mileage of an LS-6 Chevelle.

The L48 Chevelle even with a MT and 3.31 gears was bad enough, I'm the original owner of a '71, she's a garage queen these days.