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North Central Kansas | What transmission and gear ratio? I have a 2003 daycab Freightliner with the same engine. Fuller 10spd with a 3.90 rear end. Mine has about 700,000 miles on it. Mine will run 65 if you want to. We run on mostly county blacktops and keep it in the 55mph range. The other guy I cut with has a 1998 with a 12.7 but with less hp and 4.10 ratio with a 10 spd. Can't remember what his tag says on it. My turbo really whistles compared to his. As far as pulling the hills they are going to pull down some. Are you downshifting any or trying to make it pull over without shifting?
Edited by kstate90 12/3/2009 00:01
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Detroit 12.7 pulling ability?
