05 2500HD 6.0 4X4 ECSB What Gears?

[SGP93GSX]

Hey all,

I am running an 8" lift with 37" Tires on 20's. Right now I have 4.10's. Lost acceleration. Pulling power is down. First I am looking to swap gearsets. Looking to get a tune. Then possibly go to a front mount turbo with supporting mods. My question is, with what I am looking at in the future, would you go with the 4.88's or 5.13's? Looking to help MPG and help all around.

[DAmarcus28]

i think 4.88s would do the trick

[foggy]

I run 4.88's with 35's getting 10-11 mpg.

[BigMac]

You have aerodynamics of a barn door and are rolling on an additional 400lbs of rubber and steel. Gears aren't going to help you that much my friend. Where you're at, low gears will kill you on the highway and tall gears will be lugging like crazy in town. Money spent on gears will not pay for the difference, if any, that would be saved from any increased mileage. I've been through 4 lifted trucks and several offroad rigs. While gears are a good idea for the right reasons, better pulling down low, they are not the saving grace for fuel economy.

[SGP93GSX]

Gears aren't going to help you that much my friend. Where you're at, low gears will kill you on the highway and tall gears will be lugging like crazy in town.

BigMac,

I guess really I am trying to get the drive train back to seeing a "stock" load as far as diameter of the tires/wheels. But also looking to set the truck up for a turbo. As I have been reading the turbo likes to be "loaded" Hence the question on the 4.88/5.13.

I do use the truck for work. It has to pull a load. It does OK right now but not like I want. The gears will help unload the drive train and put the strain on the axles more so than the transmission and drive shafts. For me axles are much easier to replace.

Keep the comments coming. That's why we are all here. To learn from others experiences. Whether we like what we are being told or not.

Thanks

[BigMac]

I pondered the whole gear swap idea several times on my rides but it costs twice as much for us to do it since we're 4WD. I have found a few online gear calculators so you may want to do a search for that, I'll let you know what I find. I think it was from 4wheeloffroad.com or something like that. For your jump in tire size I would go with the 5.13's, but this may be in the high RPM range for highway use. I ran 4.56's with 35's and had no problems.

[cjriojas]

Gears aren't going to help you that much my friend. Where you're at, low gears will kill you on the highway and tall gears will be lugging like crazy in town. Money spent on gears will not pay for the difference, if any, that would be saved from any increased mileage.

LOL, this is an inaccurate statement

4.88 for your application. If you plan on goin bigger, get the 5.13s

[BigMac]

LOL, this is an inaccurate statement

4.88 for your application. If you plan on goin bigger, get the 5.13s

This is coming from someone with a photoshopped lift on their truck....