Bed Bounce Fix?

Ive lurked high and low for an answer to the bed bounce phenomenon and honestly the best i seem to have found is to put a bed cage in or box the frame. I tried a make shift bed cage and that didnt work but i just finished boxing the back half of my frame. It still is not completely gone in my head but man is it much more tame.

 

“Box the frame” - take the open channel steel frame members and weld a cover plate on? I’ve never heard this term before.

I am hoping that some added weight on the bed helps my bed bounce. 250lb camper shell + some weight inside eventually for my camping buildout.

 

For me it was weird. Weight got rid of one of 2 vibrations for me. It fixed the vibrating/rough feeling from the suspension itself, but the bed still bounced with 500 lbs of concrete and lighter duty springs. The shell itself should act like a stiffer structure for the bed which should help the bounce as well.

 

I just tried 250lb of sandbags in various configurations in the bed, no difference. I’ll take them back to Lowes and try something else. Was really hoping the $20 I spent on sandbags would help. Oh well.

 

the 99-04 taco had very weak frame rails as well. Fab places used to sell plates to weld to the sides to stiffen them up. I would bet that would help us as well. Easier than boxing the frame from a labor perspective

 

Yea boxing the frame looks extremely labor intensive. It's just weird that there nothing consistent across the board that's worked. Some people get shackles and it solves the problem. Some used weight in the bed and were good. Maybe the roads here in CO are extra worse, I don't know. There are some that are almost nauseating to drive on.

 

I did not enjoy reading that new 22 owners have found the ride “bouncy” at times. I really hope what they are referring to is NOT what we have experienced. Some stretches of roads are perfectly fine, but then I encounter 80 miles of the perfect harmonic storm and I become reluctant to road trip the Tundra as its a uncomfortable for everyone . If a $65k coil sprung rear tundra still does this that would be disappointing to say the least.

 

This looks like and old thread and maybe I didn't read enough. But is anyone actually modifying their truck to deal with highway construction?

 

my guess is that the shocks are too soft and the bouncing is likely just actual suspension travel.

the bed bounce of the gen 2 is not suspension travel. It is the frame flexing as you drive.

Shackles do help a lot, but its not perfect. A stiffer frame, better shocks, and shackles would all work together

 

I guess shackles and shocks are in my future.

 

My bed frame is cast iron from the late 1800’s, and i had to weld some steel bracing to protect the corners from vigorous bouncing. Electrical tape helped with the squeaking.

 

5160 shocks, topper, 240lb of sand, shackles with poly bushings and it still is awful in mine (on certain road types) if my tire pressure is at 40psi. At 34 psi it’s better, but still terrible.
For those thinking this is in our heads or is just the bed moving, if you whistle on one of these stretches of hwy and just hold a solid note you sound like someone is smacking you on the back every 1.5 seconds.

I’ve considered pro suspension or AccuTune’s adventure tune in some fox 2.5 with DSC, but I’m not convinced the design flaw can be fixed so easily.

 

True Bypass shocks would probably cure 99% of it but now you’re spending a shitload of money. If i ever can stop working so much OT at work im gonna have a fab shop make some frame stiffeners

 

I just avoid the highway.

 

Anybody try the willy bar? This video is suspect because he installed it in a Dodge and made his wife pretend to be two different models, but maybe it worked?

 

I don't think so. I think it's a combination of the stiffness of the frame (natural frequency) and wheelbase and spacing of the concrete on the road. Everything is perfect to hit the resonance of the chassis. Tweaking the shocks might help but any energy imparted into the chassis (ie suspension motion) would still cause it to resonate. This explains why there's no real cure, and that stiffening the frame has had (some) success since it changes the frequency enough to move it out of the range that the concrete blocks are spaced.

 

I realize I likely won't get rid of the bounce completely. I'd just be happy to find a way to mitigate it some.

 

I have experienced this. I understand it will never go away but it shouldn't be this bad. I am guessing this is primarily due to the winter hitting but it’s lately it’s pretty awful. I can watch the bed bounce horribly in the side mirror. I dropped the pressure in the tires because I usually run a little extra pressure. That helped slightly. I am going to throw a little weight it and see what happens. I might take it in and see what Toyota says. I don’t recall it being that bad when I was testing driving trucks. Now granted the Utah highways are not the greatest but still it shouldn’t be that bad. I love the truck and but the ride is pretty terrible so far. My only major other dislike with the truck is the stupid Toyota remote start.

 

Has anyone tried lowering the tire pressure, to a reasonable level, and had luck mitigating the bounce?

 

Toyota already calls for a really low tire pressure at 33lbs. I would definitely not go lower than that.

 

Noted, thanks. I think mine are at 35 right now, I’ll have to look. No point in going to 33, won’t make any difference.

 

I lowered my to low 30s and it helped. Also it’s seems to help slightly is the my tonneau cover is covering the bed instead of leaving the bed open.

 

Ive heard the poly bushings with the shackles help. I do not have them installed but when I road trip with weight in the bed the bounce is minimal. Its funny to watch my G baby in her car seat when I roll on concrete portions of highways locally. The bounce sucks, but its a truck...embrace the suck.

 

Hahaha. I hear ya man. This is the first one that has bounced for me as well- I have crewmax. fuck it.

 

Coachbuiler shackle helps a ton. E rated tires might make it worse as well, I haven’t noticed it as much going back to p rated.

 

i go back and forth. P rated tires handle my trailer just fine, however it was nicer to not need to air the e rated to the max every trip. (Trailer isnt crazy heavy)

 

Ya, I experienced this last night on the highway for the first time. Then my flashbacks to my 08 tundra came rushing back. I can't believe the 2019 CM still does it. Cmon, Toyota... And mine even came with TRD pro front suspension and upgraded Fox BDS in the rear.

 

Experienced this on the trip back from the cabin tonight. Never had it on the same stretch in my taco and was surprised by it. Hopefully the sos drop kit, sway bars, air bags, and new shocks help. Looking into cb shackles and probably custom leaf pack now

 

Only things to fix the bounce for me is higher ambient temperatures or speeds under 65mph.

 

I think I posted this before. I had an 15 SR5 Double Cab, and now a 19 Pro Crewmax. The Pro cured 99 percent of the violent bounce I would get on segmented concrete highways. Not sure if it's the cab configuration, the shocks or both, but I barely notice anymore. On the old truck, my wife would have to wear a sports bra on road trips.