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When I get up to around 90 an let of the gas I get major vibrations through the whole car and not sure what it is. If I am only going 80 it doesn't do it or at least to where I can't notice as bad. Could it be bad brakes? It only happens when I let off the gas and not pushing the brakes.
If you have a stock driveshaft then those u joints are probably toast. You probably also dont want to drop your DS while driving so I could keep the speeds low until you get it fixed.
Stock DS is a two piece design. If your u joint failed your DS could drop to the ground and proceed to potentially cause substantial damage. I would get them checked ASAP then decide how to proceed.
My buddy had a u joint fail on his truck. It destroyed the entire rear end. It could have been worse. Get your car checked out and for gods sake don't drive it that fast.