Vibration 85 K20

[72c20customcamper]

Been dealing with a rhythmic vibration. I can definitely say it’s in the front as the vibration comes up through the steering wheel . I’ve changed the tires had them road force balanced still the same . I just changed the front shocks from Gabriel gas to KYB the ride is much nicer and the vibration is faded but still there after the test ride put new KYBs on the rear still the same . Like I said it comes and goes in a rhythmic cycle . Be smooth and the vibrate then smooth out again and repeats . I don’t think it’s a balance issue and everything is tight in the steering parts ,could the springs be shot causing it to bounce at times . Almost feels like an undulation.

The vibration is mostly felt above 60 mph but is present at lower speeds too . It’s not a bad vibration but it’s very annoying.

Anyone deal with this ?