nasty vibration at speeds over 70

[97gsr]

just got the car done and while breaking everything in i notice a vibration at higher speeds and rpm's while driving. my shifter looks like it is going to shake out of the car. i put the prothane motor and trans mounts on her but i didn't think that i would notice it as much as i do. the car is a 5 speed. i also had that rebuilt and instaled a spec stage 2 clutch. i am thinking that the drive shaft u joints are bad but not 100% sure. they are origonal on the car so i think that i may start there and get the shaft balanced. the drive shaft is also stock. anyone else have this problem??

 

[Aliate X]

yup, after my TKO 600 swap I had a nasty vibration at high speeds, went to an aluminum D/S and vibration dissapeared.

 

[HaynStang]

Does the vibration happen at higher engine speeds and lower wheel speeds? Or just wheel speeds over 70 or so?

 

[68keyblr]

I had the same problem after putting everything back together. I simply rotated the drive shaft 180 degrees with respect to the rear end and it solved the problem.

Apparently the stock drive shaft is balanced with relation to the rear end at the factory

 

[Nibbie]

Check and make sure your tires are properly balanced. You may have wheel weights on the rims but they could have moved to a wrong spot and would cause that kind of vibration. You dont want to check U-jouints and such and have somthing replaced when it could have been your wheels and tires the whole time. Check the easy stuff 1st and then the not so easy stuff after. good luck

 

[97gsr]

yeah the vibration gets bad at about 65 mph and doesn't get any better as speeds increase. thanks for all of the help will let u know if that does it.

 

[1Fine89stang]

My car does the exact same thing. I have an aluminum d/s already . I'm thinking it might be something in the rear axle because there is a whine comming from it. Hopefully its not the tranny! Anymore suggestions?

 

[Nibbie]

My tranny wines somtimes and has some noises here and there, I dont usualy worry about it unless its super loud or has clunking or odd noises coming from it, Your rear diff may have old fluid in it. You can replace that and I think you have to add an additive from ford or another sorce like bg or lucas oil. Tires in general can also cause a vibration, tires aint perfectly circular and can cause a vibration or a pull. especialy if they are off balance-even whith wheel weights on it. Rims may be slightly bent but its hard to tell on the car. I usualy slap a rim with out the tire on a wheel balancer and just look at it, some rimes are fine and some you can tell the owners smacked them hard on a pothole or curb.

 

[1Fine89stang]

Im gonna do my u joints tomorrow to rule that out , im sure its not a bad idea anyway. Are they a real pain?

 

[97gsr]

no they are not too bad as long as u either have a press or a vise. getting them to turn freely after you are done can be a pain. but usually they are not too bad.