Could you explain the nomenclature? What is D1? E2? T3?
Vibration (like buffeting) 68-73MPH new tires, 3 different shops checked
- Thread starter smokey_2020
- Start date
Could you explain the nomenclature? What is D1? E2? T3?
I'm assuming that D= drive shaft
E= Engine
T= Tires
Where is T3 on the vehicle?
E= Engine
T= Tires
Where is T3 on the vehicle?
@CapriRacer @MParr is correct Engine, Tires and Drive Shaft . T3 they are telling me 3 vibrations per tire rotation (I think), I had to use my spouse's iPhone (supposedly application developer feels that iPhones are better calibrated sensors than many of Androids or more common sensors).
Overall these four Primacy LTXs are 4,400 miles into the life, my worst wear tire out of 4 is at 8.5/32s and best is 9.2/32s. If TireRack decides to honor the warranty then I will have a chance to order another set of tires from TR and will get a credit for these Primacy LTXs. However, I am willing to go to a better tire, what would you be recommending for a tire that is not prone to not being round/true, or stiff-walled?
Been a while since I had a set of tires that I liked enough to recommend, and they were Michelins!
I might have missed it, but did you get an alignment done when the new tires were put on? Its too coincidental that the vibrations appeared after the car wash incident. From past experience I have had just a tiny bit of negative toe cause issues like this. Is your most worn tire on the front or rear?
I might have missed it, but did you get an alignment done when the new tires were put on? Its too coincidental that the vibrations appeared after the car wash incident. From past experience I have had just a tiny bit of negative toe cause issues like this. Is your most worn tire on the front or rear?
It could be a tire. It could be a wheel bearing. It could be a CV joint. Seeing that you have an AWD vehicle, there are probably CV joints on every corner.
You may need someone to help you with a ride along. Have someone sit in the rear seat and get the vehicle up to the speed of vibrations. Repeat this with that person riding in the rear cargo area. You and your helper might be able to isolate the vibration to a particular corner.
If a tire is out of round, it can be seen with the naked eye. Each corner will need to be jacked up and each wheel will need to be spun. Tire hop is noticeable.
While it's in the air, spin the tires and listen for any noise coming from the wheel bearings.
I honestly don't think that it's tire hop. Tire hop will be constant. A tire problem will move with a rotation. Move both rear tires to the front and both front to rear. You will feel a tire vibration in the steering wheel.
Google wheel bearing problems 2023 GMC Yukon/Chevy Tahoe AWD.
For a replacement tire, I recommend the Goodyear Wrangler Steadfast HT.
Last edited:
It is quite possible that that alignment needs to be checked. The tire with the most wear currently is in the front right where carwash damaged tire was but these tires were rotated at least once.
An alignment issue isn't going to cause a vibration.
Also, the Primacy tires only have 10/32" tread depth when new.
I respectfully disagree with your first statement. An alignment issue may not always cause a vibration, but the odd wearing pattern of the tire can. I've solved enough handling, driving and vibration issues with a home alignment kit (the computerized machine is way better, but the plates and tape measures are convenient) that I can honestly say its happened to me before. Specifically, on my wife's Atlas, my CRV and recently on my F250.
That's not to say this couldn't be a wheel bearing or CV issue either. GM has had wheel bearing issues for many years. My 2004 ate up seven of them!! But the OP has a pile of money into this already and a check couldn't hurt.
I've solved vibration problems at home too. Tires out of round and bad pinion angles.
At the early age of his tires, there probably isn't going to be a noticeable wear pattern. The multiple shops that it's been taken to should have picked up any abnormal tire wear.
I'm betting on a wheel bearing. And, it's probably in the rear.
Last edited:
Going back to OP first post. It all started with one new wheel and 4 new tires.
Maybe carwash damaged something else, but I'd still beg/borrow/possibly even
buy, one more wheel and 4 new tires, before I did anything else.
In all the above points, there is viable hypothesis. I have been checking and re-checking everything and anything. Rotating wheels did not change the feeling. Led me to think that it is something that stays static - bearing or CV. Checking with NHV app told me that wheels trueness or stiff wall (but not balance-related), CV or bearing should be checked because of T3 vibrations. I spun wheels on the car and do not feel bearings biting. It could be that bearings or CV only show fault at speed. Pico sensor that GM uses probably can pickup a bearing or CV but that battle is still to happen (me getting GM dealer to instrument with the Pico diagnostics).
If Tirerack actually does come through, then I will still change the tires and will get the DiscountTire to check each rim. At home I will measure runout with amazon runout contraption as well.
If Tirerack actually does come through, then I will still change the tires and will get the DiscountTire to check each rim. At home I will measure runout with amazon runout contraption as well.
Did not drop from the thread, folks, just travel and got sick along the way. Finally had a chance to install Defenders and no surprise to many + NVH app said wheel balance is never a cause of 3rd Order vibrations, RF balance got previous Primacy's to <3 with zero lateral. Tire swap did not improve the vibration. NVH reports loudly the same 3rd order in the same 63-73MPH band. As soon as I get out of 63-73 NVH reports no vibrations. I have spun the wheels on the car by hand and I cannot sense the bearing binding or CV binding but unless it is very bad it is hard to detect it by hand. I live in the sticks, tough to find a knowledgeable mechanic with equipment, likely will try to take it back to GMC dealer, present my NVH reports for before and after tires change results and push to get Pico tested to see which CV or bearing is causing the vibration.
Man, hate to part with this wonderful highway cruiser, it was perfect before this ordeal. I will try to see if GM dealer can locate the offending bearing/CV but real soon I will be eating a lot into the trade-in gap territory by throwing more good money after bad.
Sadly, we are living in the world of disposable everything, fewer and fewer people are really skilled to troubleshoot and have invested in equipment to do it.
AI tools potentially can help but we are missing many sensors in many places still on the current and old gens of vehicles.
Man, hate to part with this wonderful highway cruiser, it was perfect before this ordeal. I will try to see if GM dealer can locate the offending bearing/CV but real soon I will be eating a lot into the trade-in gap territory by throwing more good money after bad.
Sadly, we are living in the world of disposable everything, fewer and fewer people are really skilled to troubleshoot and have invested in equipment to do it.
AI tools potentially can help but we are missing many sensors in many places still on the current and old gens of vehicles.
Have you changed the ride height on the truck? In other words, have you raised or lowered the truck?
completely stock, nothing changed
Is it possible that an undercover was damaged or loosened in the car wash incident? The reason I ask, during a 6 hr highway trip recently in our AWD Ford Fusion a low frequency vibration showed up that was bad enough to blur the rear view mirror. The accompanying noise came from the back of the car, so I was sure it was a rear CV axle or U joint. Turned out to be the rear trunk mounted spoiler, which was vibrating in a strong crosswind at 70 mph. It had never done that before in many highway trips. The fix was simple, I installed an additional support between the trunk and the center of the spoiler.
Admittedly a long shot, but maybe an undercover or air dam on your Tahoe is vibrating a highway speeds?
Admittedly a long shot, but maybe an undercover or air dam on your Tahoe is vibrating a highway speeds?
I'm thinking the new wheel is out of balance or slightly bent.
3rd Order vibrations are never caused by wheel balance, I learned a lot about NVH. Every rim has been checked by the installer on the Hunter Elite machine just yesterday before they mounted a new set of tires on the rims.
Inner ear pressure related vibrations I have related to the driveshaft in the past. Maybe if you have a center carrier check that for excessive slop and check the shaft for any dents or possible missing weights.
NVH analysis does not show driveshaft order 1, 2 or 3 vibrations at the speeds where I clearly sense innerear pressure only Tire Rotation related ones of order 3.