Posted by Lenny Kirby on November 27, 2007 at 17:56:26 from (75.204.9.91):
In Reply to: 2003 GMC 2500HD 8.1L posted by Matt Weltz on November 27, 2007 at 14:49:13:
I have an '03 GMC 2500HD ext cab short bed. 8.1L 5spd allison. I hyperteched mine and have had no problems I don't know what it would get before because I already had the programmer and did it the day I bought it. I pull a 25x5 triple axle 21k trailer and with light load of 5500lbs pulling tractor I will get about 7-8 mpg depending on wind. empty with no trailer i'll get 14+ between 60-65 mph won't average that but that is what the instant computer says when I drive... 50,000 miles 3.73 rear end..
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