steelbird

iTrader: (1)

My 02 trans am , has zero rated tires, I bought this car with the tires and thats what I was told- At high speeds 70 plus the car seems to shake a bit and overall rides a bit ruff, could it be alignment and tire issue - or any other thoughts, i prefer a bit more smoother ride and I think a fast car like this shouldn't shake at high speeds? Thanks

JD_AMG

Not a lot of information here.
No car should vibrate or shake at those speeds so something is wrong. Are the wheels/tires balanced? Could your rotors be warped? What psi are you running in the tires?
The overall "stiff" ride (i'm assuming jarring and choppy?) is most likely due to stock shocks assuming nothing is broken or worn out. Replacing the stock shocks with quality ones (not cheap over the counter replacements) can yield you smooth and firm BMW-like ride and handling.

Arc00TA

iTrader: (17)

My car shakes like a dog shittin razor blades at 70mph, can't figure it out. Replaces DS, brakes, been through 3 sets of wheels and tires, etc still haven't found it. All I can say is good luck. And yes, you stiff ride is due to the crappy stock shocks.

RocknRollCali87

It can be a number of things..front alignment, wheel balance (was each wheel balanced right?), bushings are worn, worn ball joints, maybe bad or loose engine-transmission mounts..

shocks that are usually worn out would cause your car to say up and down easily after hitting a bump or a dip on the road

RocknRollCali87

It could even be something in the drivetrain..not to scare you but you should have it looked at before anything gets worse.

Arc00TA

iTrader: (17)

My drivetrain has already gone to crap, my clutch is toasted and my 10 bolt is screaming for mercy, when those two go my vibrations will probably stop.

lsx24

iTrader: (45)

Hot damn like a bitch that shut's up.

CW00BlackTA

iTrader: (31)

I think you meant Z-rated tires (speed rating). That's not a problem unless the wheels/tires haven't been balanced properly. Has your car been lowered? Lowering springs are the first thing I look at for rough rides. How about an aftermarket torque arm? Those often contribute to vibration when not adjusted properly.

You need to provide more information about your car for us to really help.