intermittent rear vibration at 60mph

[PK]

The rear wheel bearings are normally called the "rear axle bearings".
They are installed on the outer end of the axle.
To replace, remove wheel, brake caliper, disc etc.
Pull axle out and then you need at least a 5 ton press to press the old bearing off, and the new one on.

But from the description it sounds like greasing the driveshaft will fix the problem. Remember there are 3 nipples, and all need to be greased.
2 x u joints and the splined yoke at the gearbox end of the shaft.

Rear axle bearing noise is very easy to distinguish from other noises.
It makes a "whup-----whup------whup" sound that corresponds to one turn of the wheel.

PK