First post....rookie when it comes to cars, but I love my GT. black GT vert with 18s...the wheel hop and handling is awful and i dont know the first thing about what to do. Please anyone have suggestions on what i need to do, and suggestions on what brand parts to use. I'm lost, and its the only thing that drives me nuts about the car. Driving down the highway at 85, hit a bump, feels like the car is going to fly off the road.

 

welcome

you have the OEM 18s, i assume?
i have a coupe with steeda 18s on a stock suspension, and i can't say i feel like my car is going to fly off the road. generally, the 2005+ mustangs have some handling issues b/c of the fixed rear axle, e.g. expansion joints in on/off ramps at speed can create some drama.

maybe you're running too high tire pressure? you could try swapping out the OEM springs/lowering the car, but you have to also adjust the panhard bar when lowering, so there's a little more involved than just swapping out the springs.

check out Professor Wizard's lengthy post on this: Prof on Handling (scroll down to the last few posts)