tdf

My 86 goes down smooth asphalt pavement at speeds 35-55 and I feel a vibration of some sort.

I just installed brand new tires thinking that the old ones were bad! That helped some but I still feel a vibration in the car.

Where should I look next? I'm starting to think this is a bent wheel or out of balance drive line or ??

Wish I had a known good set of wheel and tire to try, so I could sort this out.

ADMIN HELP: Please move to "C4 - General Discussion"

Any ideas? Thanks!

SIXFOOTER

Well, to start its Vibration with a V. Next, did you watch them to make sure the new tires ballanced out correctly with little or no runout?
Next thing to look at would be U-Joints.
Oh and the C4 section might be more help

PatG

I can attest to a u-joint causing a vibration. I had a barely noticeable vibration at ~45 MPH for years and finally solved it when I found a u-joint cap on the drive shaft was just a bit tight. I disassembled, re-greased and put it back together correctly and the vibration was gone.

Now, if you could describe the vibration a bit more there may be other suggestions. Is your vibration just noticeable or is the steering wheel shaking?

tdf

Sorry for the brain fart "Fibration".....LoL

This vibration seems to be felt in the whole car.

Are you guys speaking of the U-Joints in the drive shaft, axles or both? Wouldn't there be noise (Clunking) usually associated with U-Joint failure?

Thanks for the help.

SIXFOOTER

You need to look at the whole drive line, from the flex plate/flywheel all the way back.
Also look for a busted motormount

r44s

Had a vibration in my 73 between 57-63 MPH after many trials and errors replaced the rear spring raising the rear and the vibration quit. Not only stopped the vibration, but it looks better.