i have a 1987 camaro and for some reason when im going 60 or 70 the whole car starts to shake, i don't think its the engine because i just go it rebuilt, i think it maybe something with the rear end or springs or something. Any one else have this problems please reply.

 

where can you feel the shake? In your steering wheel? The whole car?
If its the steering whel maybe its your rotors, or maybe your tires.
If its the whole car maybe its your rear tires.
Just a couple things to get looked at.

 

its the whole car and if its the tires what do i need to do

 

have them high-speed balanced

 

Driveshaft could be out of balance. I think mine may be out, I have a similar problem.