My Car starts shaking bad when i reach around 70 mph. Same thing when i brake, slowing down from speeds over 35. Anyone know the problem? Feels like it's about to cave in.

Put a wrench on the lug nuts immediately.

If that's not it, check wheel bearings, idler arm, tie rod ends and balljoints.

Yes...
Be sure to check what Jim said! You also may want to try different rims/tires to insure they are in balance and the tires do not have broken belts. It does sound like you have a bad idler arm tho.....


Kev

Is the shaking in the steering wheel or feel it in the seat
steering wheel = front
Seat =back

Simple things 1st
All the Stuff above...
Got sloted mags?
Use std tapered nuts to alighn up, then replace one by one wth the correct nut and washer.
Try turning the drive shaft 90 deg
Check the sliders on the discs are straight and free movement
Check backing/mounting bolts on the brakes.

I'd check the universal joints too.
River

And whatever you do, KEEP IT OFF OF THE ROAD! It's ready to CRASH.

It shakes like all over...when it does shake.

Something is ready to let go. Find the problem, even if it takes you awhile to do it. Go over the entire suspension, drive train, brakes, wheels, tires, steering linkage etc.

http://csgbenefits.org/camarovibration.pdf

Try that .pdf document. It's all about tracking down vibrations in these old cars.

And please be sure to post the solution!!!!!!!!

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My Car starts shaking bad when i reach around 70 mph. Same thing when i brake, slowing down from speeds over 35. Anyone know the problem? Feels like it's about to cave in.

Did you recently do any work to it before it began to shake? Or did it just start shaking one day? Let us know if you find the problem.

I don't know the severity of the shaking... but definately check out what these guys have said. Get your wheels balanced, and your rotors could be warped. That would definatley cause what you are talking about.

Put the car on an alignment rack and use the jacks to simulate suspension heights.Have the tech run the car thru the gears to rule out drive line issues.While in the air he can also check the front end and dial indicate the rotors for lateral run out.Money well spent.Your car is unsafe and not fit to drive by your description.:thumbsup:

And check the condition of each tire. A defect or breakdown in the structural integrity of a tire will also ruin your day...