Still vibrating after new tires, re-alignment, and balancing when I go over 70 mph

Car vibrated when I'd go over 70mph and I'd hear a "whomp whomp" sound from back and it'd pull to one side. First had a rebalance and re-alignment. Vibrated less but still heard noise. Took it back, they said back tires were feathered so they replaced them with new tires but put them on the front and old front tires on the back (were still good). Sound is gone but still vibrates on highway. Took it back, re-checked tires, said they all looked good but weight had fallen off the front tires. So they rebalanced them AGAIN. Car still vibrated but now I feel vibrations in my
Experienced mechanics share their insights in answering this question :
Hello. If this is still occurring then you have an issue with something that is not spinning true or is out of round on the vehicle. If the vehicle is this new then it is usually caused by a wheel hub that is defective or a CV axle that is bad. From what you are explaining, it sounds like there is an issue with one of the axles. It may have lost a weight of its own or it may have too much play in the axle joint. I would usually get the vehicle in the air to inspect these areas for issues. I would also loosen the engine mounts to allow the engine and transmission to align themselves as there may be some binding there also. Since the vehicle is still under warranty you need to take it back to the dealer to have these issues checked.

How to Identify and Fix Common car Problems ?

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Wheel Balance

When your car vibrates every time you drive at 50-70 mph, it is most likely that your wheels are out of balance. The vibrations will emanate from the steering wheel across the seat and through the vehicle`s floor.

For example, if you still feel tire vibrations after a wheel balancing service, you may be dealing with tire runout. Tire runout takes one of two forms, known respectively as radial and lateral runout.
If you`re experiencing vibrations after a new set of tires was installed, it`s possible the tire technician didn`t quite hit the mark on balancing one or more of your tires and wheels.
Alignment. Vibration is usually caused by an out of balance or defective tire, a bent wheel or a worn driveline U-joint. You may find that the car shakes the car in an up and down motion. You may feel vibration through the seat, the steering wheel or even in the brake pedal.
Tires out of Balance

This is the most obvious and the most common reason that you might experience a shaking steering wheel. If your tires are out of alignment or out of balance, they may send shakes through your vehicle and to the steering wheel.

If your car`s engine isn`t getting enough oxygen, fuel, or spark that is needed for it to run smoothly, you`ll probably notice that a vibration is coming from the engine compartment. This issue manifests through jerks and shaking when your vehicle increases in speed, or rumbles within a specific speed range.
The most common reason for a car to shake is related to tires. If the tires are out of balance then the steering wheel can shake. This shaking starts at around 50-55 miles per hour (mph). It gets worse around 60 mph but starts to get better at high speeds.
If you notice your steering wheel shaking when you`re on the highway, it`s a surefire sign you need to balance your tires. Balancing your tires cuts down or eliminates these vibrations entirely, giving you a ride that`s nice and smooth.
If your wheels are misaligned, your car will usually “drift” when you take your hands off the wheel, and the steering wheel itself may vibrate or shake. This is a pretty easy fix – just take your car in for an alignment, and the problem will be resolved.
Poor Alignment

That said, if the alignment is off by enough, it can even cause your vehicle to shake! As the front wheels right with the rest of the car, vibrations can develop which travel up the steering column and rattle the steering wheel, shaking you in your driver`s seat.

The most common reasons for your car to excessively vibrate are a problem with your tyres, wheels, brakes, steering, suspension, axle or engine.
Misaligned tyres can cause the car to vibrate when driving at high speeds, usually between 50 to 75 mph. Hitting a kerb or driving over a pothole can throw your wheels out of alignment which, in turn, can cause your vehicle to vibrate.
Bad Bearings — Friction from bad bearings or inadequate lubrication can cause a shaky steering wheel. If bearings are the cause, you`ll notice that the shaking only occurs as you turn the wheel. To solve this problem, you can oil the bearings, or schedule a service appointment to replace them if there`s damage.
The most common reason for a car to shake is related to tires. If the tires are out of balance then the steering wheel can shake. This shaking starts at around 50-55 miles per hour (mph). It gets worse around 60 mph but starts to get better at high speeds.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Still vibrating after new tires, re-alignment, and balancing when I go over 70 mph
ANSWER : Hello. If this is still occurring then you have an issue with something that is not spinning true or is out of round on the vehicle. If the vehicle is this new then it is usually caused by a wheel hub that is defective or a CV axle that is bad. From what you are explaining, it sounds like there is an issue with one of the axles. It may have lost a weight of its own or it may have too much play in the axle joint. I would usually get the vehicle in the air to inspect these areas for issues. I would also loosen the engine mounts to allow the engine and transmission to align themselves as there may be some binding there also. Since the vehicle is still under warranty you need to take it back to the dealer to have these issues checked.

Vibrates at 65 mph
ANSWER : Have the driveshaft checked for a binding or a bad U-joint. This will cause the vibration to go throughout the entire vehicle. If you had the vehicle on a lift and ran the vehicle to the speeds indicated, you will feel the vibration in the drivetrain. A certified technician, such as one from YourMechanic, can come to your car’s location to diagnose your vehicle’s vibration issue and let you know what needs to repair.

Vibrates at 65 mph
ANSWER : A few different things can cause the vehicle to vibrate at freeway speeds. The brake rotors, brake pads, and tire balance are a great place to start. Other common causes would be the tire itself, bent rim, wheel bearing, or a suspension component failure. I suggest getting assistance from a qualified technician who will be able to diagnose the vibration you’re experiencing and perform any repairs that are required.

steering vibrates after installing tire sealant
ANSWER : The tire sealant in the front tires are causing the tires to be out of balance and the only fix is to get the fluid out of the tires and have the tires cleaned out then the hole patched. Then balance the tires again. The tires cannot be balanced with the tire sealant in the tires. If after all this the vibration still exists, you can contact a professional technician, such as one from YourMechanic, to diagnose the source of your vibration.

Significant vibrations after new rims and tires installation.
ANSWER : Unless you were previously able to operate at 90 MPH with no vibration, I would not necessarily expect such success now with the new tires and wheels. Once you get up to speeds like that, there are lots of possible causes of vehicle vibration and most vehicles will vibrate to "some" extent at those speeds. With regard to tires, brand new tires that are perfectly balanced can vibrate like crazy once in service due to radial force variation. The only way to minimize that possible source of vibration is to buy very high quality, and usually (not always) more expensive tires (e.g., Michelin). In your circumstance, part of the diagnostic would be to put each tire/wheel assembly on a radial force balance machine and measure the road force. Typically if it exceeds 25 pounds, that is the source of your vibration, especially at speeds of 90 MPH. You could also ask the balancing technician to balance each wheel/tire assembly and then remove the assembly from the balancer and re-position it on the balancer by say 90 degrees. Re-spin the wheel. If it doesn’t come up as "zero" out, the balancer is not calibrated, is not working properly, or the wheel is improperly mounted to the balancer. Another issue is your wheels may not be hub-centric but rather are lug centric which requires an adapter plate to balance them properly. There are a myriad of other possibilities. If you desire that this vibration issue be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a vehicle vibration diagnostic. If you have further questions or concerns, please do not hesitate to re-contact YourMechanic as we are always here to help you.

We have a new battery, new alternator, new coil pk, new master fuse and the car still won’t hold power.
ANSWER : Hi there. The only thing that I could think possible is causing your problem is that something may not have been correctly installed while your son was completing this maintenance. However, if your engine was difficult to start before this service, it’s possible there are different components that are damaged that simply didn’t resolve the issue. The only way of knowing what is going on with your Trailblazer would be to have one of our mobile mechanics in your area come to your location and complete a car is hard to start inspection.

Car vibrates at 35 mph and over
ANSWER : Hello there. Vibrations are a common symptom that have quite a few different causes. The most common causes are tires, rims, tire balance, wheel bearings, or ball joints. In some cases, when the tires are mounted onto the rims, a force match and road force balance may be required. The road force is a machine that is used to simulate driving and will tell the technician if any vibration is present with the tire and wheel combo. If you need help with this, a qualified technician, such as one from YourMechanic, will be able to diagnose the car’s vibrating issue and perform any repairs required.

Car is vibrating at high speeds
ANSWER : Hello. Thanks for writing in. Poorly maintained tires are the number one reason for vibration over 60MPH. Having them checked was a great idea. Another quick step is to make sure they are all properly inflated at the correct pressure. Each tire differs a little, so check the side wall of the tire for more information. Brakes can also cause a vibration. If the vehicle’s brakes are stuck partially engaged, they will cause extra resistance that will be noticeable at higher speeds. This often comes in the from of a vibration or noise. A brake issue like this would need to be inspected further to determine what is causing it to stick. Double check the tires and then look to the brake system next.