Vibration starts at 40-ish mph, continues to 55-ish, and then comes back at 68-ish and then just gets worse the faster i go.
it does not matter what gear its in, the problem persists,
the tires and wheels are new, and the problem was there before wheels and tires were replaced,
the entire rear axle has been replaced, the problem was there before and after,
the vehicle is stock height
tires are stock size
gear ratio was 3.73 and the problem existed badly, then switched the whole axle to one with 4.10 and the problem went away for a while, then came back, then i had 4.88 gears installed, the problem persisted.
i had a new rear driveline built, and the problem went away, but has come back with a vengeance.shocks
are all Bilstein and in good shape,exhaust
transmission mount has been recently replaced
transfer-case is not very old, and the tail bushing seems tight
i (we) cannot find anything loose under the vehicle