95 FLD 120 Vibration 60-70 mph

You always pull the same wagon?

 

If I had all that work done already and still had a vibration, I swear I’d have to drop driveline and check for a spalled u joint cross. If driveline was balanced it undoubtedly was spun up without any angle on the joints. Could be an issue providing new joints were not installed at the time. Don’t dismiss inter axle shaft and ride height, which I’m sure has been confirmed.

 

Only things not mentioned are carrier bearing and motor mounts. Unless the steers have a lot of miles on them. Even though they aren’t wearing uneven. They could be out of balance so bad they can’t be balanced. Happens on my Classic, usually after 70- 80k. Had one get so bad, the Truck was barely drivable. Tire still looked good, but had well over 100k maybe 130 or more. New tires seem to mask a lot of things. Make sure a rims not warped. Easy checked by spinning the wheel while placing a fixed object against the outside edge near the bead.

 

Check all of your U-joints and check the transmission and pinions for any play. Check Center bearing as stated. Check ride height as stated. Check it at different times to make sure your ride height is consistent

Check torque rods and spring bushings. Check that the leaf spring to hanger bolts have not come loose.

Check the wheel bearings for proper end play.

Airbags crooked? Check for loose u-bolts.

Vibration at certain speeds like that often are Driveline issues or Tire issues.

 

Did you figure this out? Same truck and EXACT same problem. I've changed every spring, hanger, bushing, shock, tire. Alignment is good.

 

If you’re in Joliet ,Il. Go to Cassidy’s for all your front end needs, tires,balancing.
Great deals every week along with great customer service. If you call before there could be overnight parking , so you could be first in line in am.

 

Sometimes shocks don't last long at all.

This makes me question whether that is a problem why did the tires do that to begin with?

I know you can't do everything at once but if that is unknown to you whether they've ever been changed or they haven't been since you've had it they probably are really wiped out.

If they are actually bad then you have to fix that first and then see if your vibration changes.

What else to check? Airbag ride height, wheel bearing adjustment on all Wheels, I like the balance beads for the tires, three axle alignment, rear bushings / torque arms, loose axle u-bolts or spring hanger bolts, check that pinions are tight... tires, tire wear,
and tire height can play games with you.

By the way it is very difficult to isolate the vibration just by how you feel it. It is very common you'll feel it in the front end but it's actually the back end throwing you around or I suppose Vice versa. I guess the idea of looking at a square frame with something out of alignment or out of balance that throws it would explain that it manifests in different areas.