Today, I had a Valley Industries (Lodi, CA) light duty (600/6000#) hitch installed on my XLT Screw. While driving home, I noticed the former bed shake was greatly (!) diminished. There is still a very slight side-to-side jiggle, but the conspicuous up-down shake at both corners was eliminated.

Incidentally, this particular hitch installation did not interfere with or require any relocation of the Magnaflow 15834 (dual rear outlet) tailpipe hangers...a great relief since I didn't want to weld them to the frame as the factory hitch requires.

 

It's all in your head. The only thing that can 'cure' bed 'shake' is to drive on smoother roads. It is actually your cab that is shaking relative to the frame.

 

na bed shakes has rattled the hinges on my bed cover to where i have to play radio louder with back slider open . 4 heavy duty hinges to boot.

 

inbred...18-20 months ago, when I was the first to notice the 'jello beds' on some (not all) F150s and the topic was a hot thread, I proposed the 'shaking cab vs. bed theory' also. Later, after a few simple tests and observations, I had to admit on this board that I was wrong...as you are. A good, hard whack with the fist on the outermost corner of the bumper of a shaker will confirm that it is the bed that shakes, not the cab relative to the frame. Other tests, e.g. altering the bed load, installing a hitch, moving the spare under my tonneau, observations by many others, etc. etc. all disprove the moving cab theory. Some F150 beds, for one reason or another, shake inordinately.

 

If it was the cab shaking, wouldn't everything in the mirrors appear to be shaking like the bed?

 

Every pick up Ive had has had a jiggle. My 98 was like that and noticed it much more when I had a cap on it.

I usually look at the road anyway.

 

My bed had a mild case of the shakes and I had the damper installed which reduced it to almost none. I finally cured the shakes completely by having an Undercover put on the bed.

P. S. My truck has the factory hitch.

 

Inbred, after installing my Roll Bak aluminum tonneau cover, the shake is gone totally. It never really was a big deal to me(probably from the stiff frames) but I did notice that it is gone completely.
Sorry, but you are incorrect.

 

After I had the lift installed, my bed started w/ the shake. Mine does it in the 50-60 range.

 

Not sure how many people have taken Rigid Body Mechanics, FEA, Solid Mechanics, etc, but if you create hard point connects between corners then a more rigid structure is created. ie less movement. Also that structure can absorb vibrations within certain modes and dampen the original vibration.

 

Huh?

 

IronDad...Voila! Just as I said...I added a hitch.

 

I don’t have bed shake. I get truck shake on bumpy roads though.

 

 

My truck BED used to shake, but I put a Bedrug and Retrax on about 2 months ago and I haven't noticed it lately. I wonder if the weight (maybe 50# total) makes a difference. Gonna have to go for a ride and check 'er out.

Hmmm...