Originally Posted by CutterWolf

The "spacers" I'm talking about are installed by ford on the factory line. They hold the brake rotors in place as the car is being built. Any time you run after market wheels these if not taken off can cause you issues as they will not allow that wheel to seat flush against the rotor.

Originally Posted by BruceH

Any chance you still have the original wheels and tires to put on to eliminate either the aftermarket wheels and tires or the chassis as the cause of your vibrations?

I had something similar happen about 10 years ago. It turned out to be a bad tire. The bad tire was replaced with another tire that also went bad later on. I thought the tire had gone out of balance and when I took it in the tire guy couldn't balance it and spotted the tread seperation.

Originally Posted by ptaylor_9849

Go to a really good balancing shop that uses Road Force equipment. Don't just look for proper balance, look for "Runout" as well. In other words, stand directly in front of the tire and watch the tread pattern as the wheel spins on the machine VERY CLOSELY. Make sure the grooves in the treads stay straight and don't deviate or wobble as the tire spins. Then stand next to the tire and see if it looks out of round as it spins. Even new tires can have excessive runout which can cause the shaking you're experiencing. Runout is best described as a deviation from a perfect circle. Runout can be VERY SUBTLE so look closely.

Originally Posted by yc420

I'm kind of disappointed with the service from Steeda down here in Pompano, FL. I took my car there to get all of the Steeda mods that are in my sig except for the CAI. And I have had to go there 4 times already when I live almost 30 miles away from them. I keep going in because of the shaking that I get when driving. My whole car used to shake at like 50ish MPH and so I took it in so many times and it just kept happening. Then my "Tire Pressor Sensor Fault" message kept coming up and my "Low Tire Pressure" message and light just kept popping up. All of these problems happened at different times resulting me in having to go into Steeda. They even gave me 2 new front tires at one point in time. But the shaking just kept coming back. Especially at 80 MPH. When I say shake I mean SHAKE! I was driving on the highway one afternoon and not only was my steering wheel shaking, but my radar was shaking, and my seats! I looked over to my empty passenger seat and it was shaking like crazy. And you can feel it. Any how, I took it in today for the 4th time and told them about the problems (the clunking noise from the wheels when I would be driving under 5MPH and the shaking). The guy looks at my wheels and notices a tiny scratch on the front left wheel. He then goes and tells me I must of hit a curb. Honestly, I have never hit a curb with these new wheels/tires. And not only that, but if I would've hit a curb I guarantee that the scratch would've been bigger. I remember hitting a curb with the stock wheels/tires and you should have seen the scratch on that rim. Anyhow, I told him that and he just said you could have hit it going slow (blah blah blah). So anyhow, the mechanic takes my car, puts it on the lift, removes the front left wheel and what do you know the sensor is damaged and it was just floating around inside the rim (THE CLUNKING NOISE!). So the sales rep comes back out (Same one who told me I hit a curb) and tells me that it will cost me $130 for a new sensor. I said "If that's the case then leave it how it is and I will ignore the "Tire Pressure Sensor Fault" message and the clunking noise when moving under 5MPH. He says "Okay" and then 10 minutes later comes out and says "Mike(The mechanic)" came up with an idea. He said he could clamp the sensor to the piece that attaches it to the wheel so the clunking noise would go away. I said "Ok do it." So clunking noise is fixed but the sensor fault message is still there (That doesn't really bother me to be honest). So anyhow, the mechanic re-balanced my tires for the 4th time. Takes it for a ride and says there's a little nibble (slight shake) but it's nothing big. I drove it and said "I can live with that." Anyhow, so while I'm testing the car on the road near the facility my dad is inside talking to the sales rep. The sales rep wanted to charge me $45. My dad refused to and said he wanted to talk to the owner. The owner came out and told my dad "Don't worry about a thing, I'll take care of you." And then my dad said "You know between my car ('94 GT) and my sons car (my '08 GT) I've spent 9 grand with you guys. And this is what I get?" And then the owner said "Don't worry about anything, I'll take care of you. I'd hate to lose a customer over $45." So anyhow, My dad and I both agreed that we are done with going to Steeda for service. What I would like to know is, why does my car shake so badly? Is this normal? I could understand a little bit of steering wheel shake since it's a 9.5" rim but I don't think the front seats should be shaking. I really don't find that to be normal AT ALL. So any ways, they did reduce the shaking a lot.. UNTIL, I hit 80 MPH. At 80 the seats start shaking again and it just goes downhill from there. The steering wheel though, doesn't shake as much as it used to. Same with my radar which is mounted on my windshield. Halfway back to my house I let my dad drive my car and he came to the conclusion that it might be the rear wheels since the only thing drastically shaking now is the seats. Could this be possible? What is up with all the shaking? Am I wrong or is this not normal? I know people here are running some wide rims all around. I'm just curious.

Thanks to everyone who ends up reading my whole story and leaving there input. I just basically want to know what to do. ANY help is GREATLY appreciated. THANK YOU ALL in advanced.


-yc420