as u all know ive been crying lately over vibration issues. truck SEVERELY vibrates at 1800-2000 rpm (95 km/hour). i had tires balanced and i basically have a brand new tranny now. vibration was still there. it goes away when i let off fuel pedal or hit tow/haul mode. its worse up hill or under load. i had 1 stiff u joint replaced. now i noticed when its warmer outside it goes away. when its usually -12 to -45 celcius it vibrates. today its +1 celcius where i live and truck wouldnt vibrate.??????

 

Sounds like classic death wobble. Do a search for death wobble and there are all kinds of fixes from track bar bushings to ball joints and etc. Too much stuff to try to repeat here. Also pay attention to the number of vehicles with death wobble that run BFG AT's... balanced or not, there seems to be an inordinate number.

 

I'd maybe suggest a new variant: CDW - "C"old "D"eath "W"obble

 

lol lol. who knows. its gone. truck drives mint now