I am intrigued by this idea but not sure how this can be verified, maybe some special equipment, hmm.
GX550 Overtrail Vibration
- Thread starter connorville
- Start date
I am intrigued by this idea but not sure how this can be verified, maybe some special equipment, hmm.
Mine isn't the AVS or it's sensor(s), because it's unhooked now and those shocks are sitting in a box in my garage. Could be a sensor on the eKDSS though. Maybe...but I have disabled the eKDSS by pulling the fuse and it didn't change the ride, although I have NOT ever disconnected the physical connections of the sway bars etc. or removed them. Why couldn't some models (and not others) have bad body mounts? I don't know much about body mounts in general, but I just know that I do notice vibrations from the engine come through my seat more than perhaps I should, even when parked with engine on, so that's why I am speculating that. The engine idle vibration could be me just being oversensitive to it too trying to figure this suspension thing out. I dunno. At this point I have basically decided to live with it, but will continue to report back here with anything else I find.
Not saying it can’t happen just thinking it was be more pervasive if that was the case. Intriguing for sure
Well Lexus BNE came through and have provided me with the “Elevate” package which gives me the same benefits as Platinum. Still no word on the specialist to look at the vibration issue…
09:48 in
I also came from a lifted Gladiator and made the switch to the Premium GX550, but ever since I put 285/75/17’s on here, it’s been vibrating worse than my Jeep ever did. I can understand some road feel when swapping from a 20” wheel and street tires, but this is getting annoying. The rear seats are always rattling around in my rear view, no matter how smooth the road is. Is this a Lexus suspension issue?
I have aftermarket suspension now and I believe it is NOT the shocks or springs. I think it may have something to do with the sway bar connections. Trying to figure out how to temporarily disconnect them, physically do that. Not just pull the fuse, to see if it changes.
Been wondering the same thing since December, and also, if any way it could be the Overtrail rear diff.
I’ve been planning to force the eKDSS into operation back and forth, over and over.. Have a tight, rugged, steep mini canyon near my house I plan to use….
I can also tell you that after my tech tried to disconnect it manually, and then realized it would be much more involved and put it back, the bumpiness felt a lot more significant. But he also did the diff drop that day, so who knows!? I did drive it without the engine skid on as well. My next move is to put it into 4lo, and then pull the KDSS fuse, then put it back in 4hi and drive it on the road. I have already pulled the KDSS fuse and drove it, but after I did that, I realized that the sway bars remain connected, so I would have to pull the fuse when they are not connected somehow. I am not sure that simply putting it into low range will actually completely disconnect all the sway bars at once, since eKDSS is an active system. I wonder if there is some "secret" dealer mode you can put the truck into whereby it completely disconnects? I feel 100% certain that is there was, my freaking dealer wouldn't know about it, sigh. Maybe somebody on here can shed light on this?
Also, just did a road trip last weekend in it with family and full trunk of stuff, but not too heavy of stuff (firewood, suitcases, food, etc), and I almost felt it drove rougher with the load than not, which is a first. Now, that might have something to do with my aftermarket setup...I will keep investigating!
eKDSS does not disconnect the sway bar. What it does is relocate the point (rear) or points (front) that the sway bar connects to the frame. This allows one side of the front or rear to droop while the other side compresses, or vice-versa , without twisting the sway bar. But if the fuse is pulled during one of those conditions and the eKDSS can't relocate back then it will be the equivalent of twisting the sway bar with both left and right sides at equal compression, thus transferring more weight to one of the wheels.
If you want to test and see if eKDSS and/or the sway bar is involved, just remove the sway bar end link from the knuckle on one side (left or right). You could do front and back at the same time, or do one then the other then both. Typically off-roaders will tape or zip tie the loose end link to keep it from swinging around and getting damaged.
Update from Lexus on replacement was denied it’s not surprising however it is surprising they have ghosted those with this issue I’ve been running wild peak LT (3ply sidewall) at 28psi just to tolerate the passenger seat shake…helps but mileage dropped from 19-15 mpg
Have those with the vibrations gotten a full road force balance with a hunter elite system? I had a CX-5 that also had a vibration issue that would physically make the wheel shake back and forth if you took your hand off the wheel. The only fix was doing a road force balance using an advanced tire balancer, not a run of the mill one. One time we got new tires and the shop had a regular road force balancer and even thought the machine said everything was good there was still a vibration. Took it to a different shop with an elite and redid the balance and the vibration went away.
Same vibration issues for me, 2024 OT. Felt almost 100% in the seat and it comes and goes. Today on my way to work it was about a 35 mile drive mostly highway and it actually felt smooth and then on the way home it was the worst it’s ever been. I’ve switched drive modes, multi terrain, select, and doesn’t seem to make any difference. I bought mine sight unseen because of the demand and I ended up getting it from a dealer about 100 miles away. So the first time I got to drive it was when I was leaving and I noticed within about 30 seconds the vibration. After I got home the very next day I took it to my local Lexus dealership. They did alignment and road force balancing on all four tires and got most of them down to mid 20s or below. It improved the ride about 15 to 20% but it’s still not great.
Just found this on FB. Not sure if he’s on here, but an interesting discovery nonetheless
Saw that too, and I commented to follow the post. Not as easy to just remove the sway bars on the OT models.
Just getting back as I had said I would...he disconnected the end link on one side. Then put it back. So that is really not helpful. But I will continue to see what else we can do to evaluate. Getting it offroad again this weekend too, which will be first time since lift. So, we shall see if things get settled in (or break!! gulp!!) after some serious flex.
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