Vibration problem

diver said:

My 300 Disco suffers from vibration from about 50mph. Particularly bad about 60 especially just as you lift off a bit. Feels a bit like going over those rumble strips.
Both rear wheel bearings replaced after one collapsed few months ago. Rear shocks the same. Have been under it and can't find a thing wrong. All the bearings feel OK,A frame ball joint OK, no obvious play in U.J.s or prop shafts, no movement in any bushes etc. Rear wheels balanced.
Vibration comes generally through the body not through steering wheel or brake pedal.
I've been hoping it will get bad enough to find the problem but that will probably lead to it spitting a wheel across the M3
Any thoughts?

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david451 said:

Is the vibration coming through the gearstick at that point, problems like this are usually drive line.

wheel bearings usually rumble and the noise changes as you go around corners, and different speeds.

Wheels usualy come in at certain speeds, ie, 30, then 60 but in between little problems, unless you have a buckled wheel or something of course.

Diffs tend to make a **** load of problems when you let power off, but a bad diff tends to howl, same with a gearbox, if it was as bad as that I would expect it to be noisey and vibration through gearstick.

Check engine mountings, gearbox mounts etc, and take off the props to check the ujs they might be foked, make sure there is also no lift on the flanges in both front and rear diffs and the gearbox both sides.

I have seen ujs that look ok but get them off and they are foked.

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