So I have an 07 GT with about 5,000 miles on it. I have put an eibach pro kit on it and flowmaster exhaust. For the past two week I have been fighting a loud raddle that is coming from the rear ov the car. I have climbed under the car and tapped on shook and lubed everything I could get my hand on. I also removed the spare and jack and I havcen't changd it at all. Any body have any ideas I am all out.

 

I have the flowmaster kit and if the pipes are straight and centered in the GT tip cut-outs you won't have an exhaust rattle.

It seems that every car that I have lowered and changed suspension on has had a rattle shortly after install. I think all of it has to be re-torqued after installation and some miles on it. I put the Ford Racing Suspension on my car three months ago and now I am having a rattle. I have to re-torque the struts and lub the gromits on the sway bars.

Also, you should torque everything on ramps or on a wheel lift. Don't lift the body and then torque stuff. You need to torque and check everything with the weight of the car on the suspension. Good luck.

 

Is it a rattle you hear when you go over a bump... or is more like a vibration rattle at certain RPMs? When I first put my A/Ts on, after about 100 miles, I started getting a consistent metallic vibration sound at 1400 - 1600 RPMs.. turned out it was the axle-back clamps not being torqued down enough. Good way to test: with exhaust cool, go under car... push up on clamp where axle-backs join the over axle pipe... if you can lift more than a inch and see physical move of the pipe at this joint, they're not tight enough. After I had these torqued down, could hardly budge pipes.

 

I have the AT Flowmasters and also have a rattle in the back. But its not the mufflers. Its my trunk lid. I can push down on it and hear the same rattle I hear when driving. I have lubed the little rubber bump stoppers and that helped for a couple days, but the rattle has come back. Maybe I need to use a better lube since that area does get wet and probably washes it off.

 

When you did your suspension did you get a adjustable panhard bar? I did and that is what my rattle was, the bar kept coming loose.

At any rate keep this in mind; anything dealing with the suspension or body on part contact is always magnified in sound. Look for any exhaust or suspension rubs.

Good luck

 

Ya I have checked for clearence around the entire exhaust and there is plenty of room. All of the nuts and bolts are tight I just checked them yesterday. I lubed all of the bushings also and it made no difference. The exhaust clamps are tight that was my first guess also. The rattle/squeak happends while I am on the freeway, go over bigger bumps, and when the exhaust is at a certain tone. The squeak is diffentaly a metal to metal sound and the rattle sounds like a piece of steel round bar vibrating against a body pannel. I is also a significantly loud rattle.

 

check where the exhaust goes over the axle and under the rear subframe, right in the bend going down to the muffler, thats where mine rattled. when I hit sharp bumps or let of the gas and let the motor slow me down, I got a rattle. just kept tweaking the exhaust till it didn't hit.