WHEN ON THE FREEWAY THE TRUCK START TO TILT BACK &FORTH GOING ABOUT 60 TO65 MILE HR
Monday, March 25th, 2013 AT 9:04 AM
Depending on situation, it could be transmission or engine related.
Does it occur at higher speeds? If you have problem getting it to run smoothly at higher than 65 mph, it could be due to fuel starvation. Check the fuel system, have the fuel filter replaced.