I’m getting the new brakes put on the 28th, as well as the meeting with the engineer.
GX550 Overtrail Vibration
- Thread starter connorville
- Start date
What color combo? Able to port delete any options you didn’t want?
Nori Green / Black Onyx / Chateau. I was able to port delete the rock rails. Told my sales rep he's a super star when I found that out. Should be here (hopefully) by the end of the month, or shortly thereafter.
Also am having the same brake replacement that stoberts have had and others. Parts coming in on Monday. Let’s see if it helps the vibration issues. I have noticed that when I drive in comfort mode my vibration is barely noticeable so I have been leaving it in that mode.
That’s what I think some times and then jump on the freeway and get above 75 and there it is. Not feasible to drive more than 10-20 miles at freeway speeds before it’s intolerable. Bananas that Lexus won’t even try to chase it down. Several things they could try like put it on a 4WD dyno and eliminate road conditions. That would confirm drive train vs suspension.
Just remember to take this all with a grain of salt. Maybe the brakes fix it, maybe they don't, maybe a few vehicles are messed up, maybe a few people are sensitive. Maybe you need to get your tires road force ballanced. Maybe there is a problem on them all. I have seen one person who maybe got the car lemon lawed. Most people don't have an issue with this. Of course if you do, when you google it, this thread pops up, so we have anyone with an issue showing up here.
I didn't have an issue, put on bigger tires and noticed a vibration similar to what others have said. Got the tires ballanced and it went away. That doesn't mean it isn't an issue, just that it isn't an issue with mine or for me. But my brakes do squeal so I am getting that fixed, hopefully next week and it will be interesting to see if the ride changes at all.
This is interesting. Motortrend lists chassis vibration as one of the cons for the GX in this article. Wonder if it’s the same vibration people are experiencing in this thread.
It lists it as a con at the top, but within the body of the article, it states: "...lamenting the vintage vibes its traditional body-on-frame was transmitting over bumps, which too often resulted in untoward rattling and creaking". I sure do wish they would have elaborated on that!!
Just got my brakes done for the TSB, unfortunately no change, still has the vibration.
All good info to help track down the cause. Process of elimination.
I do still think it could possibly be the AVS shocks, but let's just suppose that it's not the AVS shocks and it's not the brakes. I am also still thinking it could be the body/cab mounts, or the bushings that connect the sway bars. How does one check these? I assume replacing the body mounts would be really tough, but how difficult would it be to temporarily remove the sway bar and test drive one of these trucks? These are things that the dealers (and thus Lexus) are not willing to do. I have already asked.
Again it seems like a friction issue that shows up with speed. parking brake dragging or a sensor on the brakes coming on when it should not. Since some folks seem to have fixed it with a brake mechanical maybe the tech could check those?
Not the case for mine. As noted a few times in here, there are possibly two to three different issues being experienced on this thread.
Update on my case….
Lexus put a set of 20” wheels from a Luxury on my OT. They test drove it and said the vibration went away. They put my 18’s on the Luxy and they felt vibrations in it. So now they are waiting for approval from Toyota/Lexus AU to change the tyres over on my rims to try again. They have offered me an opportunity to test drive my OT with Luxy 20” wheels when I am back for the next attempt to fix it. Personally, I hope it is just the tyres as that is an easy fix. Highly unlikely, but maybe there is a defect in the rims? Maybe it’s a dampening issue? I would like to know the weight difference between the OT 18” combination compared to the Luxy 20” combination. Sometimes it feels like the shocks struggle to dampen small bumps. It’s a similar feeling I got in my 150 Prado when I put some heavy AT’s on it. The shocks struggled with the weight, sometimes feeling like axel tramp.
Lexus put a set of 20” wheels from a Luxury on my OT. They test drove it and said the vibration went away. They put my 18’s on the Luxy and they felt vibrations in it. So now they are waiting for approval from Toyota/Lexus AU to change the tyres over on my rims to try again. They have offered me an opportunity to test drive my OT with Luxy 20” wheels when I am back for the next attempt to fix it. Personally, I hope it is just the tyres as that is an easy fix. Highly unlikely, but maybe there is a defect in the rims? Maybe it’s a dampening issue? I would like to know the weight difference between the OT 18” combination compared to the Luxy 20” combination. Sometimes it feels like the shocks struggle to dampen small bumps. It’s a similar feeling I got in my 150 Prado when I put some heavy AT’s on it. The shocks struggled with the weight, sometimes feeling like axel tramp.
That makes sense to me OT. the high speed woulld exaggerate the problem. Those tires only have 7/32 of tread new. I thought that fact was surely intentional for some reason.
Update
Today I had my colleague drive along me on the passenger side and observe the tire behavior. We were talking over the phone live. Over a few miles at speeds of 40 on both new smooth pavement and older rougher pavement he indicated it was obvious the right rear tire was bouncing constantly while the right front was smooth as glass.
Looking at the part numbers on lexus parts online for the OT, Luxury, and Premium, they are all different part numbers for the AVS shocks. This leads me to believe the valving is all different in the town tube shocks. The drive mode in directs the ECU to change the ride mode in the AVS shocks from comfort, normal sport, etc.
Based on this information it is my belief that one or all of the following may be causing the bouncing.
Programming is set wrong
Faulty valving in the rear shock(s)
Aggressive valving in the OT for heavier over landing loads causing shock stiffness when roads are not demanding longer travel stroke.
Would love to try sourcing oem rear shocks from the luxury or premium trims to experiment ($571 new) or unplugging the rear electrical connection or just waiting for more aftermarket suspension options available (king, icon, etc.).
Anyone have any suggestions??
Lexus letting us down
Appreciate the update. What is Lexus’ next step? This sounds like a case where they need to buy the vehicle back from you. I know 2 other members had theirs purchased back. Is that option for you?
It is an option and they opened that avenue for me to pursue, however I don’t want to part ways because there’s not a replacement vehicle made that checks all these boxes. It’s amazing except for this one small issue. Sure there are little things they could have. done better like add rear a/c vents in the OT+, more cubby’s for storage etc. the HVAC is poor in my opinion, the awkward transmission clunk when shifting from park but these are all adaptable and easily forgotten about after 3 months. This shake and their blind eye approach to run it down is unacceptable and uncharacteristicly evil behavior of Lexus
Man I feel your pain. I’d be frustrated as heck if I were in your shoes. I’m just praying that when I get my 2025 OT+ that it won’t have this issue. Spoke with my sales rep just last week and she said she hadn’t heard of the vibration issue. My dealership has delivered about 30 OT’s to date. She has heard about the squeaky brakes though.
