Unknown and inconsistent vibration

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tron67j

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Your tires can be balanced but still have a defect in the rim that would provide the sensations you describe. I would recommend having a reputable run shop thoroughly check each rim without the tires attached.
 
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caulk04

caulk04

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Have you checked to see if your parking brake shoes are performing as expected? And not hanging up, causing vibration. Whether you routinely use the parking brake or not.

Just a thought.
Parking brakes were rebuilt in March, no issues there.
Your tires can be balanced but still have a defect in the rim that would provide the sensations you describe. I would recommend having a reputable run shop thoroughly check each rim without the tires attached.
The tires are all wearing nicely and everything spins nice and true
 

Sherman Bird

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As I was working my way down the posts I was thinking you need to find a shop with a vibration analyzer. See @Sherman Bird ’s post.

They are a bit costly for a home mechanic or one time user. Sometimes it’s worth paying a pro. Finding one is the hardest part.
My NVH tool alone was 2 grand.... and it requires an expansive oscilloscope which has to be loaded with and calibrated with software compatible with each other.... not to mention my dedicated diagnostic computer. Yes, the cost is in the 8 grand range all in. But, I do it for a living and have been misled by old fashioned methods of vibration diagnostics. An example is the Hondas which have that very expensive motor mount with a computer controlled vacuum chamber to smooth out engine vibrations. It is easy to point to that as the cause because these mounts have a history of failure. One of my Accord customers came in and had the dreaded vacuum operated mount vibration symptoms.... I installed my NVH equipment a found a 100 dollar transaxle to body mount, which was WAY cheaper to fix. Easier too.
 

Daw14

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Parking brakes were rebuilt in March, no issues there.

The tires are all wearing nicely and everything spins nice and true
Maybe some of your recently changed parts are not holding up like they were designed to ,or might have got some knock offs.
 

Wheatboy

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Years back, when someone ran a yield sign and t-boned me, insurance screwed me over and replaced my aftermarket step up bars with dodge crap ones and, sadly, I didn't notice until after I had an intermittent vibration which ended up being the bar's crap bolt/nut stripping/breaking. Ended up having to get both bars welded to eliminate it from constantly re-occurring.
 

Tominator223

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Bad rim or tire. Even when balanced a tire can still be bad. Look at sidewall for bumps & waves . Tread as well.
 

Hagar1

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I always try to get American made whenever possible. When I couldn't get American made Goodyear or Firestone tires for my 3500 truck, the supposed tire guru at The Tire Rack steered me to this great Kuhmo tire. Short on options, I reluctantly ordered a set of four. These tires didn't last two years before the two rear tires exploded a day apart from each other. In the interim, I also chased a mysterious vibration. Tires were remounted and rebalanced by everyone I took them too. A few alignments were done, rotations, even a rear driveshaft was done. Nothing solved the vibration. One summer day while passing the Philadelphia Airport, one rear tire separated and I put on a spare. The very next day, the other rear tire exploded. On with the other spare. I have extra wheels and tires and some dedicated winter tires for the 2WD trucks. Low and behold, no more vibration. I saved the old tires for warranty purposes. The Kuhmos must have had internal tread separation that could not be detected or balanced out. I called The Tire Rack and they could care less. Not satisfied, I left a scathing review that they never posted. Buyer beware when dealing with The Tire Rack.
I certainly agree with your assessment of Kuhmo tires. They are pure garbage, they wear out quicker than an eraser in a class of grade ones.
Is the vibration speed related? If you have access to or perhaps know someone with a frequency counter, it might help to solve the issue.
 

Hagar1

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Years back, when someone ran a yield sign and t-boned me, insurance screwed me over and replaced my aftermarket step up bars with dodge crap ones and, sadly, I didn't notice until after I had an intermittent vibration which ended up being the bar's crap bolt/nut stripping/breaking. Ended up having to get both bars welded to eliminate it from constantly re-occurring.
You just triggered another thought in my old brain. Could it be possible that something like the step up bars?
Years ago, I was asked to test drive a car for a noise / vibration. The shop foreman wanted to overhaul the transaxle. We went out on to the highway and and after a mile or two, I stopped, pulled off the add on roof racks and drove away ..... noise was gone.
 

MrMagumba

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Don't give up. My similar vib was at 55mph regardless of gear/rpm. Paid the dealer for their vibration analysis and they were stumped. The guy who put in my bed liner listened to it and thought it was something in the axles because the drive shaft rotates 3 or 4 times as fast. So the frequency of the vib could point you somewhere. Interestingly when I did my first oil change with full synthetic after trying all different things with no luck, the vib shifted to 53 mph and there it stayed. Bought my 2021 1500 Hemi with 40k miles. Good luck. I'll keep watching for more ideas.
 
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