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TundraGeneral discussion forum for the 2007 and later Toyota Tundra.
This is a discussion thread titled "I think I actually cured my "bed-bounce"", within the Tundra forum, part of the Truck Forums category.
I am a bed bounce/oscillation sufferer and have been since day one with my truck. I now have about 5k on it and have noticed the different ways it reacts to different road conditions. I found that my oscillation would never start on the first bump in the freeway, it would take about 5 or 6 to start the oscillations at freeway speed. I tried putting 50 lb. bags of sand equally spaced in the bed but nothing seemed to help. A few weeks ago I started a thread called "speed bump test". I wanted to know if anyone else fealt their trucks back end oscillate up and down for a couple of seconds after hitting a speed bump at 10 mph or over. I wasn't alone. Many people do. Ever since I made that post I've had a picture in my head of when I was a kid jumping on a trampoline with a friend. We used to "launch" each other by timing our jumps so that when one was almost to the max depth the other would be right behind him on th way down. The one right behind would catch huge air. I started thinking that that may be what's going on with my truck. Once it gets in the rythym it continues to launch the back end. Just a theory, though, I'm no engineer. With the thought of launching in my head I started noticing that I only get oscillations when both rear wheels hit a bump at exactly the same time. A bump on the left or the right side only was handled smoothly. I decided to try something different with my sandbags. I put a sand bag in front and behind the drivers side wheel well thinking that it might change the compression on one side only, throwing a kink in the rhythym. To my complete surprise I was right. I just got around to doing this tonight and took a test drive on a road I drive on every day going to work that rattles my bed terribly. ZERO oscillation and the ride is night and day. Give it a try and let me know what you think.
I am going to get a 45lb weight plate (like the ones at workout gyms) and put it in my bed permanently on one side. It wont take up alot of space and wont be such an eye sore
The gas tank is only a single tank on one side like the Gen 1 right? Did you notice any difference in bounce when the tank was filled to different levels?
The gas tank is only a single tank on one side like the Gen 1 right? Did you notice any difference in bounce when the tank was filled to different levels?
The gas tank is mounted to the frame, not the bed. I doubt it will have any effect on the bed bounce.
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
I put a sand bag in front and behind the drivers side wheel well thinking that it might change the compression on one side only, throwing a kink in the rhythym. To my complete surprise I was right.
The bed bounce is actually a bed wobble. By adding the weight to the front you are dampening the wobble and lowering the resonant frequency of the bed. I don't have the bounce, but when I looked underneath the bed of my truck it appears that there's very little reinforcement there. I bet if someone welded up two crossbars that tie into the front and back bed mounts going across the width of the bed, it would solve the problem. Toyota has always made a flimsy bed for all of their trucks in terms of flexing excessively. I doubt there's any reg cab owners that have the problem due to the shorter wheel base. The DCs would have more bounce because of the longer wheel base amplifying the bouncing in the back (kind of like the back seats in a school bus launching you up in the air going over a bump ) I'm really surprised that toyota hasn't figured this one out yet.
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
It may be a band-aid but if it works. To me if a enough people fix a problem cheaply Toyota may say we can do that. For people who won't try they are not being bothered with the problem,I for one am not being bothered. I don't have to drive on concrete.
Thanks for your help. I agree with those how want Toyota to fix this problem. If we figure it out Toyota may make the proper repair. I too have this bounce but deal with it. My wife on the other hand will complain on trips, I don't blame her.
Just to be perfectly clear, we are talking about the "bed bounce" over expansion joints in concrete roads right? Caused by some harmonic frequency in the frame. NOT the stupid oscillation of the bed in the Ford video which would never happen in real life.
Sounds like you're on the right track. Since you're seriously looking for a solution, here's something I mentioned before that you might try. Light years ago when I worked in a Ford shop, I remember a parts man saying that some Gabriel Shocks had a way different compression/rebound ratio than most other brands. In other words, it took less impact to compress them but yet they rebounded at a different rate. Might be worth risking $50+ if they still make such an animal. I agree with you, it's just a matter of interupting the osicillations.
Ever since I made that post I've had a picture in my head of when I was a kid jumping on a trampoline with a friend. We used to "launch" each other by timing our jumps so that when one was almost to the max depth the other would be right behind him on th way down. The one right behind would catch huge air.
One time I ended up in a tree 15' above my trampoline because of this.
Sounds like you're on the right track. Since you're seriously looking for a solution, here's something I mentioned before that you might try. Light years ago when I worked in a Ford shop, I remember a parts man saying that some Gabriel Shocks had a way different compression/rebound ratio than most other brands. In other words, it took less impact to compress them but yet they rebounded at a different rate. Might be worth risking $50+ if they still make such an animal. I agree with you, it's just a matter of interupting the osicillations.
Or maybe the guys that installed the Rancho shocks might want to try to set them different from one another?
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I think I actually cured my "bed-bounce"
) I'm really surprised that toyota hasn't figured this one out yet.
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