car vibration/shaking

I first noticed my cars handling sucks on the highway the first day i got it....When i go past 60MPH the car shakes violently and its wicked annoying.....Since my tires were pretty much bald..i replaced them and got a 4-wheel alignment......For some reason it still shuddered and shook on the highway......MY shocks/struts were going out too so i got those replaced and got another alignment.......I thought i had finally solcved my problem but as soon as i got onto the highway again...the damn bitch still shakes and virbates at any speed past 60MPH

What do you have in the rear end? Open, limited slip, locker, spool?
My '69 had a similar problem, though it happened around 45-50mph. What I did is remove the center section from my 9" and stuck the axle shafts in it without the case. I then turned the yolk over with it bolted to a stand and watched the endplay of the axle shafts. One moved up and down .75". At low speeds, it wasn't enough of a difference to cause a vibration, since the bearings could hold it in place and the shocks could dampen any vibration. Once I got goin fast enough, it would vibrate in pulses... fade in vibration and fade out.. probably 1 'pulse' every second.
Unfortunately, you most likely have an 8.8" axle, which you can't take the center out to test like in a 9". You probably have to take it to a shop and have them run some tests on your differential.

were your tires properly balanced?

Might also check your driveshaft to make sure it is not bent....my 96 had a bent driveshaft and I replaced it with an aluminum driveshaft...stopped the vibration in it's tracks.

how much is a driveshaft

I've seen the Aluminum Driveshafts for $100

Actually, the cheapest I've seen the driveshaft for is about $179.00...but it is money well spent in any case...

were your tires properly balanced?

Good question! Also check out your motor mounts. Had that problem bad in my VW!

one thing you should also check is the brake rotors. I had a similar problem and I fixed it by scraping any debris between the rotor and the spindle

i cant seem to find an aluminum driveshaft for my Mustang....can someplease please give me a website

Driveshaft is a good possibility. Check steeda.com for an aluminum driveshaft, or a Ford racing and performance parts store.

Sounds like your ball joints could be shot also. Have them inspected and have new ones installed that are greasable. When I installed new ones on my ride, it was like driving a new car.


One more thing to check, is the motor mounts. Ive replaced mine (both sides) once already, and one is cracked as of now. That would also cause a lot of shaking and vibration.

do u notice a vibration coming from any certain point in the car? i noticed a bad vibration coming from my front right tire at about 60 mph and it shook the whole car. turns out it was the u-joints. might wanna give those a look as well. that was my problem. good luck man