First post here, bear with me. Hopefully someone can help me out or give me some guidance with this problem. The entire truck started shaking/vibrating excessively (like I was driving over washboard) once I got over 80kph (50mph), if I took my foot off the gas and there was no vibration, put it back on and there was vibration. I coasted and tried the gas several more times at 70kpm and 60kph with the same results.

This same phenomenon happened about 2 months ago when I got it up around the 80kph mark. I am pretty limited in my mechanical skills (change tire, check fluids, etc) and will need to take it to a shop but was wondering if this sounds like something anyone else has had a problem with or educated guess's.

Thanks in advance for any help.

 

Sounds like it could be a problem with your motor mounts. Look for any cracks or broken bolts on the mounts.