2002 stratus vibration between 50 and 60 mph

Its possible you have a damaged wheel. A wheel could have been damaged/warped when the first set of tires were replaced. Spin balancing machines "balance" the tires at about 30 mph. Generally that covers things up to 60 or 70 mph on the road.
You may need to have the wheels checked with a gauge to see if any are warped or bent.
Make sure the vibration is not affected by engine torque or other factors. Does it matter if you are coasting at 70 mph or pulling, etc.
A miss-fire in the engine could be transported thru the passenger compartment and cause the same effect, but the check engine light should come on.
If the problem started right after the new tires, I would look at the wheels first.

Does the shake match tire rotation or drive shaft rotation speed? If it's at tire rotation speed,have the new tires been dynamically balanced on a brand name motorized balancer?Re balance them that way.If a wheel weight has come off you will have a shake.You can also rotate the tires from front to back and see if that helps.Also,brake rotors can be out of balance and even with a perfectly balanced tire,the rotor can throw the balance off.

Most likely a tire/wheel balance issue. The weights that are used to balance the tires can sometimes fall off. Generally how far out of balance it is determines when and how bad it will shake. Unfortunately this is not fixable without a tire balancing machine, has to got to a tire shop.

Were the tires rotated or replaced recently? Most major tire shops will check the balance for you at little or no charge if you take it back to the shop where the work was done.

You can also try to identify the problem tire by rotating the front and rear tires one side at a time. For example, if the vibration is coming from the front, swap the front and rear passenger side tires and drive the vehicle again. If the vibration moves to the back it's most likely the (now) passenger side rear tire that's out of balance. If the is no change, try the driver's side tires.

Hope this helps!

A vibration such as you are talking about could be caused by more then one thing. First it could be caused by a broken belt in one of your tires. I could also be caused by a bent rim, a warped rotter, or a bad cv joint. I hope this helps you solve your problem.

Your shuuder sounds like it m,ight be coming from a CV joint losing it's grease or going out of balance. Take it to a front end shop for diagnosis. It's free.

You need to have someone look at it that is experienced in NVH (Noise, Vibration and Harshness). Front end vibrations can be caused by many things. Each possibility needs to be systematically eliminated to find the cause. Someone who is experienced in this can eliminate several possibilities by simply driving the vehicle...Did the tire shop even bother to road test it? I'll bet not!

Sometimes INTERNAL tire problems can cause a vibration that cannot be found (or eliminated as a possibility) by putting the tires on a balance machine. To eliminate this as a possibility, rotate the tires front-to-rear one side at a time then drive the vehicle to see if the vibration changes or "moves". If it does, then the tire that just got rotated to the rear is the problem.

Also, the vehicle can be run on a lift to see if the vibration can be duplicated in the shop. Many times, if the vibration is being caused by a drive axle or CV joint, it can be located by running the vehicle on a lift this way. In the case of 4-wheel drive vehicles, it will be necessary to engage the front axles to get them spinning on the lift.

The entire steering and suspension system should be checked for looseness in the tie rods, stabilizer links and frame bushings, control arm bushings, etc. Any looseness in any of these parts can cause vibrations at certain speeds.

I have also seen vibrations that act similar to a tire being out of balance that occurs when the brake rotors loose a balancing weight on some vehicles. This may or may not apply to your vehicle, (yours may not have balance weights in the rotors) but this type of vibration can usually also be verified by running the vehicle on a lift.

Have the CV joints checked for to much play...worn out...like a warped drive-shaft on older rear wheel drive cars. Hope this helps.

Most computer controlled tire balancing machines which are in use today only balance tires to between 65/70 miles an hour. To get them balanced to a higher speed you might want to call a few auto performance shops and see if they balance tires to a higher speed. At higher speeds it takes very little in the way of an off balanced tire to really set up a vibration so shake.

bigc

Talked to Buick/GMC mechanic at the dealership claiming everyone was giving me different answers/things to replace. He said undoubtedly it was cv joint/half shaft. Changed driver's side, that fixed it. Another give away was it wasn't as bad when car was cold, but got worse as it drove a few minutes, i.e. everything got hot, expanded and therefore was looser.

The main clue was it wasn't RPM specific, bearings were okay and I didn't feel it in steering wheel so much as the whole car in a given RPM range despite gear (not the engine or front end of tranny, i.e. torque converter. Rotating tires had no effect.

It could be the shop has bend the shaft or put a big dent in it or knocked the balance tabs off,causing imbalance. should be the shops expense.