I have a 2004.5 ram 2500 diesel in my signature. Yesterday it was -45 celcius with windchill here in sask canada. In town driving truck is FLAWLESS. When I went on highway and accelerated it was good until 92-98 km/hour. I felt a vibration in steering wheel.. when i let off fuel pedal it was gone instantly or when i go down hill so i ruled out tires etcc... when i hit tow/haul button to take it out of overdrive it went away as well. and it always happened around 1700-1850 rpms. if i speed up to 110 km or 150 km hour it was gone also. if i idle truck in park it idles fine at all rpms. do u think driveline,ujoint,flexplate,torque converter or tranny issues?
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