Car is a Mk1 Golf with manual 5 speed and 1.8lt engine.
When travelling at above 60kph and accelerating or cruising I've noticed a slight whirring, or grinding noise. It almost sounds like a tyre is rubbing against something, thought I am very certain this is not the case (new suspension, tie rod ends and recent wheel alignment).
The sound stops when decelerating and is not heard at low speeds or at idle.
Clutch and gear shifting feels fine, though there are worn linkage bushes.
Could this be wheel bearings? Or gearbox bearings?