I had an 03 f-150 and it didnt do this.

When I go over rough parts in the road my bed rattles and I can hear it and see it in my side mirror. When I get out and see if the bed is fine it feels rock solid.

Anyone else have this issue?

 

Any chance you have your trailer ball in the reciever/hitch?? Mine rattles like crazy... If you are seeing it tho, there could be something wrong, maybe suspension related??

 

I think it maybe related to the extra depth they added to the bed of our trucks... i sometimes notice this to, doesnt bother me that much and it is very little of a rattle i can only see out my side mirrors i cant hear the rattle. So yea it may be caused by the extra depth possibly adding extra weight.

 

every truck i've owned, the bed shakes. even my '00 ranger.

 

I have the 6.5 bed on my '06 XLT (4x4) and it really shakes when I go over bumps. I watch in the mirror and it really, really vibrates. But, like you said it's rock solid when you get out and check it. I think it is engineered that way, think what would happen if it didn't have any "give" in it or vibration. That would transfer into frame to the point that you'd feel every bump and every nut and bolt would loosen or parts would wear out faster. Honestly, this is the smoothest truck over bumps I've every been in. If that vibration we see in the mirrors is their way of absorbing the impact even better of bumps then I am all for it. I'll have to ask my buddy who is an engineer at Ford what the deal is.

 

On my '04 short cab there was very little bedshake. My new 06 supercab on the otherhand shakes like crazy, and I have less then 400 miles on it. If you compare a standard cab to a supercab/supercrew you'll notice the bed is further back on the main rails and butressed with a secondary chassis. I believe this is the cause all the shaking and quaking. I wouldn't worry to terribly much, I see alot of new body F-150s on the road doing the same thing.

 

it's an engineering problem and ford needs to remedy it!
i call it the 'diving board' effect. in my supercab 6.5' box it does transfer into the cab and i can feel it. it shakes at the resonant frequency. i can't believe ford engineers through all their test and computer analysis(FEA) didn't find it or had it show up. what do they get paid for?

they need to change the resonant freq of the box, by either adding bracing in behind the panels(out of site), change the shape of the panels or adding weight(different gauge steel).

i can shut my tailgate and feel the shake of the bed while still holding the top of the tailgate. i don't have to slam it either.

i've posted about this before if you do a search.

 

Heh, never felt it get back into the cab. Only really notice it offroad or over the cracked pavement on the missile range I work on.

 

My 04 screw does it too. I have the undercover on it and once that is on it stops immediately.

 

It is normal for all trucks, the cab is rubber mounted and the bed is solid mounted to frame.It is to isolate the noise and vibration from cab and occupants.The frames are very stiff on our trucks so the suspension can do what it needs to instead of frame flexing.

 

Mine does it too. As long as the bed doesn't fall off the truck while I'm going down the road, I don't worry about it.

 

Gonkey has the correct answer.
All pickup truck beds do this because the bed is bolted directly to the frame. The cab has rubber isolation mounts, what you are seeing in the mirror is actually how effective the cab mounts are at eliminating vibration.

The current production (04 and newer) F-150 has some of the best isolation mounts of any truck to-date. On older trucks the mounts were not as effective so the visual difference in the mirror was not as noticable, the cab was moving around almost as much as the bed.

Also note the rigid F-150 frame allows a tight bed-to-cab gap, if the frame flex was not very low the two could contact each other under extreme situations like hard off-roading. Note the very wide gap required on the F-250/350 SuperDutys which have a stong but flexable (C) channel frame.

 

Mine does it real bad when I hit the speed bumps in my apartment complex at 15-20 MPH even worse at faster speeds.

 

LMAO! If you're worried, maybe you should slow down.

 

Yup, what Gonkey said......