My 90 camaro RS vibrates really bad when I reach 50+. I put on new front tires and the problem went away. After a couple of months the problem was back and I found out that the left front tire was out-of-round a little so I went back and the balance and rotated (front to back) and the problem is worse. I am about to get dirty and would like some help on what could be the problem and what to check. Thanks!

 

Might need an alignment,possibly some broken or old front suspension parts.Loose parts, get a good mechanic to take a look at your front end.

 

Thanks, but I found that my right rear axle is bent.