Very bad Vibration Problems! Need Help fast!

I have a 1985 t-bird and at around a speed of 80km/h, it will start to vibrate. When you start going 100km/h the entire vehicle starts to vibrate so bad that you can't even talk to somebody who is sitting in the passenger seat. It sounds like the rear end, but now im starting to think its my front end. I was thinkin about replacing c/v's and and maybe pinion, sounds like an alignment problem i have no clue? I need help as fast as anyone can! Thankz!!

Shake the front end down really good, look for loose balljoints, wheel bearings, tie rod ends, and other steering linkage parts. Also, check the tires out for separated belts (bulges in the tread) and any abnormal wear. If that all checks out good, have the tires balanced.

Will do, i was thinkin in the line of ball joints tommorrow i will give everything a check thanks!

i have the same problem, i was told that the rackn pinion and the tie rod ends were most likely the problem.