Made me think of something else: has anybody who is experiencing the highway harmonics tried removing the spare tire? Perhaps Toyota's test mules did not have spare tires, and thus never experienced such a situation...
Just some random thoughts
Anybody want to try without the spare tire at all?
Made me think of something else: has anybody who is experiencing the highway harmonics tried removing the spare tire? Perhaps Toyota's test mules did not have spare tires, and thus never experienced such a situation...
Just some random thoughts
Anybody want to try without the spare tire at all?
ya ill rip that bizzle out tommorow and go for a drive...
I keep seeing a lot of references to South California highways and people using the term "bed bounce". The bounce from the California highways (and some other state highways) is a TOTALLY different issue than the "bed bounce". Read the following and then decide if what you have is actually "bed bounce" or if it is the other problem.
The California highway bounce is due to the spacing of the expansion gaps. It makes the whole truck bounce up and down due to the wheel base length. That is why it will go away if you drive slower or faster. Once again, this is NOT the "bed bounce".
When you go over irregular bumps, and your bed bounces from side to side like a paint shaker, but the cab remains mostly still, that is "bed bounce". You barely feel the bed bounce in the truck, but you can see your bed shaking through your mirrors. That is what the article linked in the first post is trying to fix. That fix will almost positively do absolutely nothing for the highway bounce caused by the expansion gaps. However, it could indeed work as a harmonic dampener like the person planned it to and reduce the side-to-side shake of the REAL "bed bounce".
Watch the Ford "Prove It" bed bounce video on YouTube and you will see a very severe case of the Tundra "bed bounce". If your truck is doing anything close to that on your highways, then you have way too many potholes in your highways.
there are no pot holes on the freeway that could killsomeone. that is how it is driving on most of the freeways down here. i get the vibrations over speed bumps, the crazy shaking on the freeway, i can see the flex in the back window when its not shaking the crap outta the cab. ill try it just to try it, not like taking off the spare tire is something super difficult
Fact is this was like the lottery. Toyota could not have tested this IMO. The wheelbase, combined with the frame flex, combined with expantion joints on highways in CA. Come one really.. who would add all of that together.. One more inch, it prob wouldnt be there..etc
I had a small amount of this bounce and dropped my rear tire pressure a couple pounds less than the front tires. This also helps tracking on the road..it's an old timer trick but still works.
I just want to throw this out there, and this has been mentioned before. The Bed bounce does exist and to the extent people are complaining, my CM goes nuts at 70-80 mph. I live in So. Cal. and it's on the concrete freeways that are poured in 15-20 ft sections. We drove to a x-mas party last night and my wife had to stop reading because it was so bad. I Love this truck and still wouldn't trade it, even with the bounce. Guys are talking about "what bed bounce" but they aren't driving in the same conditions. And to add to the section pouring there is very heavy truck traffic on socal freeways. The roads were designed 20+ years ago and they didn't anticipate or engineer for the large trailers and heavy shipping containers. As a result the roads breakdown and shift due to the extreme weights. A great example is the 710 and 91 freeways. You locals know what I'm talking about. So Basically what I'm getting at here is, guys from Texas and Colorado shouldn't be flipping out about never feeling the bed bounce, like I shouldn't flip out because my truck doesn't drive well in the snow or my de-icer doesn't work when there heavy ice on my mirrors. What the hell would I know about snow and Ice conditions?
I have noticed this on concrete sections of highway but no problems since I added the camper shell and have my wooden platform and dog crates in the back at all times.
No feeling of loss of control but felt pretty queasy when it did happen.
Now that I am aware, I have been watching other trucks though and I see them doing it. I can tell if my bed is moving because I am looking through dog crates - the only time I really noticed anything on normal roads was slight motion while I was sitting in the backseat ....
I was wondering if this could be a balance issue with the ring gear in the rear end not in perfect balance ...
I mean just a little bit of it being out of balance would cause a certain occilation and harmonic issues running through the springs bed and etc ... being that some have it and some dont ... sort of like how a gyro works at first it would be fine and spin even out of balance slightly but at its harmonic apex (where its most sensative) it would start to shake, buzz and its balance would get worse and worse until basic harmonic failure and fall down like a kids toy like a "Top"
I have noticed some say if they go very fast it seems to quiet down and some that go slower it also seems to stop, thus perhaps pushing it out of its harmonic balance apex (this really does seem to be some sort of harmonics problem)
Again this is just something I was sitting here thinking about and am no expert in any way.
Or perhaps some slighlty out of round bearings in the differential case or at axle ends or axles even being just slightly out of balance, perhaps this design is very sensative to harmonic frequencies in a certain range, once a bad freuqency starts it would spiral out of control until it is either under or above its most sensative harmonic range.
I remember some of the Ford F-150's having some sort of problem in the rear end and they were "re-indexing" the drive shafts, perhaps the frames in these Tundra's just need a perfect balance or a better one, I have seen they are recalling some of the drive shafts due to a hardness issue, but who is to say if that slipped through perhaps the balance is a problem as well??
Or perhaps some slighlty out of round bearings in the differential case or at axle ends or axles even being just slightly out of balance, perhaps this design is very sensative to harmonic frequencies in a certain range, once a bad freuqency starts it would spiral out of control until it is either under or above its most sensative harmonic range.
I highly highly doubt that. As many people have stated, it does it on some roads and not others. You would have different issues from a bad bearing, axleshaft of gear set. noises and it would change frequency at speeds, yet still be there. It would also be on all vehicles with the same parts. Toyota would notice 100,000 vehicles with poor wheel bearings!
lol well I sure was not saying 100,00 trucks in anyway ... it seems you assume that every truck has this issue and thats not the case by any means ... just some have it and it's not only on bad roads as you state.
Like I said they recalled a few driveshafts so that proves they arent using the same exact correct part in every truck ... things will slip through.
Oh and by the way I love Tundra's this is not a smear campaign its just food for thought to get to the bottom of this issue and I think an easily correctable one once the right ingrediants are in place.
that has nothing to do with bed bounce, that foam rubber (snake oil) does not apply here, since the spare tire is attached to the bed, come on guys let's be real, any bed is going to bounce some.
You obviously don't have the bed bounce issue. Take a look at this pic straight from toyota's web site, spare tire is attached directly to a frame crossmember, not to the bed.
So you can keep being negative, and saying homemade solutions wont fix a problem you don't have, and dont seem to understand. Those of us with the problem, will keep trying different things to try to fix it, or lessen the bounce.
Re: Possible Tundra Bed Bounce CURE FOUND
Linear Mode
