New here with question on vibration. It seems that when ever I get the my '84 up over 90MPH I always get a vibration. At first I thought it was the alignment, or tires. But I have gotten new tires and the car was re-aligned at that time as well. Any ideas guys?

By the age of your car I would say its the ball joints.

By the age of your car I would say its the ball joints.

How much do you think those are to replace or repair? THX

upper and lower ball joints are $30 each X 2.So about $120 for the front plus labor

upper and lower ball joints are $30 each X 2.So about $120 for the front plus labor

Thats not to bad, any part store have these or where is best place to buy? Going to hit up the normal WCC, Zip and Ecklers to see who has these.

Try Corvette Central too.

I would say shocks, before ball joints. ball joints (lower), have indicators and any self respecting shop can tel you if they are good or bad. Shocks are very common after years of use, as they go and will cause bouncing and vibrations.

hmm 84 vibrates from 70 on up i was thinking shocks but i guess i need to look at ball joints to

Depending on where your feeling the vibration, it could be in your driveline or half shafts. If these haven't been touched scence 84, then it could be time. On your driveline, there is a counter weight on it to help balance and keep vibration down.
Check your wheel bearings front and rear, and your suspension bushings.