Gear selection for 4x4

[bozo0981]

can someone tell me what gear would help my truck with gas milage? I have a 99 Sierra that has 6" suspension and 3" body lift with 37" Pro Comp Tires and has stock 3.73 gears. So what gear would be good to help me get better gas milage?

[JWolfe75]

can someone tell me what gear would help my truck with gas milage? I have a 99 Sierra that has 6" suspension and 3" body lift with 37" Pro Comp Tires and has stock 3.73 gears. So what gear would be good to help me get better gas milage?

At least 4.56 maybe 4.88


read through this
http://www.4wheelonline.com/superlift_tiresize.htm

[bozo0981]

hey man thanks for the help. How much you think it might help?

[JWolfe75]

A ton. It'll bring you back to stock ratios.

[bozo0981]

well thats good because it gets a horrilbe 10 mpg now

[Rays4x4]

I have 4.56 with 35s and it's better then stock when I had 3.73s. For your 37s will be just like stock, for more power, go with 4.88.

[bozo0981]

i aint lookin for power really jus gas milage.

[JWolfe75]

Pics of said truck.



:aniteef:



and welcome to the site.

[Rays4x4]

i aint lookin for power really jus gas milage.

I meant torque. The less the engine and transmission has to work, the better gas mileage you will get. Im not sure if 4.88 is Highway friendly. Might have to check in to that. I know 4.56 is, mine is ok on the highway.

[bozo0981]

o well i will prolly go with 4.56s and nice truck by the way. I have been thinkin of gettin rid of mine cuz of the gas but if i can get around 15 to 16 ill be a lot happier cuz i really hate to get rid of it esp. bein my first truck

[Rays4x4]

Thanks, I get about the same gas mileage I got before. I don't drive my truck hard either. All my cars look new, even 10 years later.

[bozo0981]

what kinda milage does it get?

[M1kRipper]

I have the exact same specs on my truck. I get about 10 mgp, 14 hwy.

[bozo81]

same as mine?
and ray what size are the ring and pinion gears in your truck?