1973 RS LT Z28- chasing a vibration above 40 MPH

[BigBlock73]

Flajunkie
Have you reached out to big gear head.
He is wealth of knowledge
He helped me out when I was having issues with my axle

 

[FlaJunkie]

Flajunkie
Have you reached out to big gear head.
He is wealth of knowledge
He helped me out when I was having issues with my axle

No, I haven't. But I did find a local performance restorer that is less than 2 miles away. I will stop by there later and see if i can trust them. They charge $77 and hour for their work. Ouch.

 

[COPO]

I would swap the 4 tires/rims with a friend and see if the
noise goes away.

 

[FlaJunkie]

I would swap the 4 tires/rims with a friend and see if the
noise goes away.

Did that a long time ago...made slight difference. Putting the radials made a difference as well. Still vibrates at high speeds. Thanks.

 

[Pro71bird]

I have a vibration above 65 MPH and need to try a new set of wheels. Everything else hasn't helped.

 

[jbloake]

Had a vibration you could feel in the seat of my 4x4 with 4 wheel disc brakes . I was blaming the tires because of age. Installed different wheels and new tires for winter . Same Vibration , no change . Replaced rear rotors ,Problem solved ! Drums may act the same .

 

[FlaJunkie]

Replaced rear rotors, problem solved!

I keep looking at the added rear rotors as a possibility...

 

[Twisted_Metal]

I have a vibration in mine... Very specific speed, 62-67 mph. (3rd or OD)
I know it's a pinion yoke issue as I "temporarily" shimmed the u-joint to almost eliminate it. (Long story)

To do it right... I need a new yoke and a set of gears as the current ones were never set up properly and have had a whine to them for the past 50K miles.

Anyway... Check for side to side play in the u-joint at the pinion yoke.
The u-joint can be tight when checking its rotational movement but move along the axis of the u-joint within the yoke.

Lots of ways to cause a vibration like you describe.
I wish you luck!

 

[bcc7771]

had the vibration issue to. all new front and rear suspension. brought to shop tires and all re-balanced. Were new by the way....well long story short....broken transmission mount.

 

[Glenn LaBonte]

Check your pinion angle.