Quote:
Originally Posted by 1990SSchevy65
2003 CCSB 4x4 6.0 auto 1500HD, not sure of the rear gears 11-12mpg, but I know I have a 25 gallon tank ha ha. I get right around 300 miles to the tank.
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The 03 1500HD has a 3.73 rear end. They bumped it up to a 4.11 in 06 I believe. That is about the same mpg I get out of my 03 1500HD CCSB 4x4