Suspension lift ?

[mmayo]

I have a question for those of you with 2500HDs with the 6.0L engine/4.10 gears. I am trying to convince my self that I would get better gas mileage with a lift! Since we have the 4.10 gears, putting bigger tires (35") would essentially lower the ratio from 4.10 to ~3.73 which would lower the RPMs giving me better mileage! I know that usually this is not the case because the engine has to work harder to turn the bigger/heavier tires, but with my particular set up (6.0L w/ 4.10 gears), it doesn't have to work that much harder.

 

Help me out guys, what do yall think?

[Mark_in_Tulsa]

Well it might help if you spend most of your time on the hwy. Like 70 to 80% hwy.

Plus I do belive you will be much MUCH less aerodynamic. And that will hurt you on the hwy. So I don't think your gonna gain anything. But It sure will look cool

[GF7PE]

My mileage went up alot. I was getting 8-9 c and 11-12 h with stock pcm and 33's now I get 10-11 c and 14-15 H with 35"'s and westers 93 hot tune. For some reason the mileage got worse with the 33's and the hot tune.

[Collector]

Around town it will get worse, it takes more pedal to get rolling all the time, but the highway you will gain mpg. I know because I have 4.10's and 37" tires.