Shimmy at speed...

[theman1990]

My 96 GT has picked up a bit of a shimmy at about 55-70 mph, and most pronounced at about 65-70. Got new rotors, and the wheels are balanced, and I have not curbed it or anything. Anyone have any ideas?

EDIT: Doubtful it's the driveshaft... it is felt hardest in the steering well, and a lower frequency vibe than what would be a driveshaft. I have had a warped shaft (new aluminum one that some stupid mechanic POUNDED the u-joints into) and it doesn't feel like that at all.

I am thinking maybe an a-arm bushing or something? Sound right?

 

[MY Cobra]

hmmmm, how bad is it? I am not sure what it would be if you just had everything lined up.

 

[40th GT]

Have you balanced your driveshaft?

 

[2013 Geee T]

I had something similar and had my rotors turned and had the wheels balanced on the car instead of off. Supposedly it balances the wheel with the rest of the moving parts. Its all fixed now.

 

[theman1990]

Where and how do you get it balanced ON the car?!? I have never heard of that!

 

[2013 Geee T]

I went to a shop that specializes in alignments. Even though I had my tires balanced 3 weeks ago they said they were off.

Its a machine that they put under your car while the wheel is off the ground that spins the wheel and they balance it that way. I think its more of a go by feel thing because I didnt see any computer connected to it. He was doing it by eye and touch.

Maybe you got a crappy balance job too. Have you tried putting the rear wheels on the front to see if that makes a difference?

 

[Indiana]

Also heck the alignment and for slop in the steering linkage.

 

[AdRock]

I'd be willing to bet that the shop did a bad job balancing them, OR they didn't hammer on one of the weights well enough and it has flown off. I've seen this happen too many times. Take it to a different place and have them check the balance.