Ok I have 1984 GN pretty much stock suspension. It has the GTA wheels on it but I had bought it that way and beefed up the sway bars when I got it. The problem is when I hit the brake pedal just barly pressing on it the rear end locks up instantly I never had the happen before the brakes have always worked perfect and I never had a complaint. Now I really can't and should not be driving it. It just happend out of no where. I was cruising and screwing with a Vette and I hit the brakes to slow down for a turn and I had to clean my pants after that. The rear end locked and the car jack knifed at about 80mph thats a good wake up call Any ideas???