I have a Series III which has developed loud bearing rumble on overrun. and I'd like to lay the symptoms before the group.
I shall have to get it fixed... I may have been pushing my luck getting home.
1: Loud bearing rumble on over-run, lessening during engine braking.2: Changes with road speed, not engine speed.
3: Not affected by clutch operation or gear selection.4: No change when transfer box in neutral.
5: Signs of propshaft oilseal failure on rear axle (and chassis and read tub and all over...). .From this, I doubt that it is gearbox or front axle. It may be the transfer box, but I think the rear axle is more likely the source.
I plan to check the wheel bearings for play, but I'd suppose that I'd have to drop the rear propshaft and pull the halfshafts before I take it to a garage.