So YOU'RE the one who was playing "mud bog" up here!!! We need to talk. People are water skiiing in the ruts you left

 

KJB...back in those days, my ride was an OLDS Super 88. When the mud got too deep, my lady (usually of BC origin) and I headed back to town and a martini/crab dinner.

 

@F150 Diesel : I just ran across this post. I am having the EXACT issue with my 2013 Supercrew. I'm just at 138k miles. Had the brakes and tires replaced (by two different shops. Sometime afterwards (not sure when - there was some back and forth with the brake shop). Anyway, now when I hit the smallest bump - even where cracks are sealed in the asphalt - it feels like the bed of the truck is loose and over-reacts to whatever it hits. This is driving at low speed - idling even. As long as the riding surface is completely smooth, no problem. Recently drove down the interstate at 75mph and as long as it was smooth - no problem. Bed bolts have been checked, shocks replaced, tires re-balanced. Today, I took the tailgate off and drove around the block. No improvement. Added the Hellwig 7705 rear sway bar. Again, no improvement. Hoping you eventually found something to fix your problem. If you did, I'd love to hear about it. Thanks.

 

That member hasn't logged in since 2006.

 

What shocks are you running? I installed Ranchos and now have bed bounce. Doesn't really bother me too much.

The newer trucks are very light with the aluminum beds and are more prone to this.