RPMs at 60mph?

[ab]

What are your rpm's at 60 mph? I have a 06DC running 285/70 17 Michelin AT2 tires (33") with the 3.91 rear end and the Bilstien adjustables set to the fourth ring +-2". At 60 miles per hour, on my handheld GPS, my truck is turning 1800 rpm. The speedo on the truck reads about 54mph @ 60 due to the tire size difference. I consistently get 15 mpg (adjusted for odometer error) in mixed city/rural driving - not much highway or stop and go. I would like to know what a stock 06 DC is running for rpms @ 60 and what the 04 DC with the 4.10 are running @ 60.

[rzintegra]

Originally Posted by ab

What are your rpm's at 60 mph? I have a 06DC running 285/70 17 Michelin AT2 tires (33") with the 3.91 rear end and the Bilstien adjustables set to the fourth ring +-2". At 60 miles per hour, on my handheld GPS, my truck is turning 1800 rpm. The speedo on the truck reads about 54mph @ 60 due to the tire size difference. I consistently get 15 mpg (adjusted for odometer error) in mixed city/rural driving - not much highway or stop and go. I would like to know what a stock 06 DC is running for rpms @ 60 and what the 04 DC with the 4.10 are running @ 60.

06 dc running factory 265/70/16 2k rpms = 65mph 1.5k = 60mph.
this may help also Tire size calculator nad this RPM/MPH From Gear Ratio Calculator by Wallace Racing

[Highwaylizard]

Originally Posted by ab

What are your rpm's at 60 mph? I have a 06DC running 285/70 17 Michelin AT2 tires (33") with the 3.91 rear end and the Bilstien adjustables set to the fourth ring +-2". At 60 miles per hour, on my handheld GPS, my truck is turning 1800 rpm. The speedo on the truck reads about 54mph @ 60 due to the tire size difference. I consistently get 15 mpg (adjusted for odometer error) in mixed city/rural driving - not much highway or stop and go. I would like to know what a stock 06 DC is running for rpms @ 60 and what the 04 DC with the 4.10 are running @ 60.

I just switched out the 4:10's on my 04 DC to 3:91's. I am not sure about the 60 MPH as I always ran at 75. Before at 75 MPH I was turning 2600 RPM's and now I run 75 MPH at just under 2200 RPM's. The 2004 only has a four speed transmission whereas yours has a five speed.

In town I get around 15 MPG and on the highway I am getting just over 18 MPG. Pulling the trailer for my landscaping company I get 12-13 unless it is really heavy (when we cut trees) and I only get 10-11.

[GORILLA]

hi not to be rude, here. i mean no harm.

but i rember there is a big thread on this from 40 i think up to 80mph.
check into it.
gorilla