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Old 10-08-2013, 11:49 AM
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Join Date: Apr 2010
Location: Macomb, Illinois
Age: 52
Posts: 713
Gender: Male
Vehicle: 2004 Quad Cab diesel
Trim Level: SLT
Color: Silver
Engine: 2005-20?? 359ci (5.9L) Cummins ISB 610 24-Valve Diesel I6 325hp 610 lb/ft
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I'm not sure what your trailer looks like, but my guess is it cathes a lot of wind. Once you get up to speed the weight of the trailer doesn't mean as much as how much wind it catches. My guess is it won't hold 5th gear because the computer tells it 4th gear is better for the load your pulling.
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2004 3/4 ton Quad Cab, 24 valve 5.9 Cummins
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