2004 chevy 2500HD with vortec 6.0 liter with a GT5 label so I think it has 4.10 gears. Can I change the gears and get better mileage and lower rpms

5

Asked by Feb 28, 2016 at 04:34 PM about the 2004 Chevrolet Silverado 2500HD 4 Dr LS Extended Cab SB HD

Question type: General

I have a 2004 Chevy 2500HD that I just bought. It has the Vortec 6.0 liter V8.
Its running 2500rpm at 70mph on the highway. Can i change the rears in the
rearend to get better mpg with lower rpm.

4 Answers

77,785

You probably have the 3.73 gear ratio in the rear end, if you had 4.10 you would be running up around 3200-3500 RPM. I'm not sure you'd really want to go with a higher gear ratio with what that set-up is, cause it would be a lot more strain on the trany, especially pulling anything heavy.

1 of 1 people found this helpful.
5

I was thinking of trying to go with something like 3.55 gears so that it would run lower rpm on the highway. Does anyone have any helpful information. I dont pull anything with the truck. I will be driving it on the highway mostly.

10

You have 4.10 gears and that's all the 6.0 2500hd came with... What I want to know is can I go to a 3.73 or even 3.55

1 of 1 people found this helpful.
77,785

I wouldn't do the 3.55 gear ratio, 3.73 is what I use, I have that in my K1500 4X4, it runs about 1700 rpm at 60 mph. and at 1500 at 50 mph with the 4lE60 trany.

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