The saga began when I got some new tires.
Before I got my new tires at Belle Tire, the car didn't pull to either side or shake at any speed. After instaling the tires the car pulled to the left like crazy, the steering wheel shook left and right on the highway (a tiny bit) and the car shook like it had the roughest idle on record. They adjusted the toe on one side when installing, and said the castor adjustmentwas off on the front right... I took it back right away and after some jerking around they decided to fix the castor for free. They then determined that the control arm was bent when they adjusted the castor to the max and it still didn't go back where it should be.

Circular logic.
1.They said that the castor being off will not effect anything negatively.
2.They said that the reason I never felt anything pre-new-tires was because the tires had worn to compensate for it.
3.They said that there is no need to adjust anything further because it will not cause improper wearing of the tires.

The problem with that.
How can the same problem wear the old tires, but not the new ones?

Question.
What is wrong with my Blazer? I had the tires balanced and rotated and the problem got a little better but it still needs to be fixed. To describe the shaking, it's like a very, very imbalanced tire, but they're balanced.

BTW. highway=65-75mph

 

If you had the tires rebalanced and one tire isnt defective, it could be a bad wheel bearing.

 

I thought about that, but if it was that it would mean that it was damaged when they put the tires on because it didn't happen before.

I read about road force balancing and that sounds like it could be the problem. Does anyone know more about road force balancing.