2011 FX2 Eco. I noticed that my truck was vibrating at higher sppeds. I did need new tires. So I purchased brand new tires and changed brake pads and rotors only in front. Vibration continued. I then noticed that it appears that vibration is coming from the back. I can see the corner of my bed slightly going up and down. I am going to replace shocks and brake rotors hoping that will solve the problem. Because any passenger especially in the back seat jiggles lol. Anyone have this issue before? Do you think it is the rear shocks? Another question I tow a roughly 6k lbs travel trailer. What would be a good set of shock? I do not want to put air shocks or adjustable etc. I want to put just regualr but I guess heavy duty shocks. Any suggestions?

thanks

 

Did the vibration change at all after front brakes and new tires?

Have you checked the rear differential fluid? how many miles on it? has the drive shaft been removed at all? sometimes they are finicky if not indexed the same as factory installed.

when i purchased an 06, i noticed a bed vibration on the test drive. it turned out that there was a bit of mud in one of the rear wheels. After they cleaned it all was well.

for shocks, you will likely get a lot of votes for bilstein.

 

When I replaced tires vibration improved a little but it still vibrates. truck has 100k miles on it. I have not check rear fluid. The drive shaft has never been removed. Nothing on rim, super clean. I do have Ford esp still for another 20k miles but they do not cover rear shocks or brake rotors. I was thinking of replacing those 2 first and if it still continues take it in to dealer and see if esp covers whatever it may be. what do you think?

 

Short box or long?

 

Biggest thing that made a difference in my bed vibration was changing the rear shocks. I went with Bilsteins. Also, anytime I have any weight in the bed, the bounciness goes completely away. I moved my tools, and the floor jack to the back of the bed. That helped as much as the new shocks. Mine is a different year, but both truck gens had the same issue.

 

bilstein shocks

 

This is why I think I need to replace shocks. when I have travel trailer hooked up no vibrating. I have 8 ft bed.

 

I was looking into them. Since my truck is stock height should I go for heavy duty yellow instead of 5100?

 

4600 and 5100 are pretty much exactly the same thing. Except 5100 front shock is adjustable.

 

4600 should improve towing? I do have level bars. Also has anyone heard of these.....

Monroe Load-Adjusting Shock Absorbers 58640