Hello everyone.
I have a 2003 2500 Cummins with power upgrades with a nv5600 6-speed, AAM 11.5 373 gears. I use it to pull a 5th wheel RV. The 1st gear I use for maybe 3sec and 6th gear revs a bit high cruising down the highway, feels like I could use another gear. I think the best way to...
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