If you're lucky a secondhand diff centre may resolve some of the noise problem.
Worse case scenario you get the s/h one re-shimmed and do a swap over if the bearings and crownwheel & pinion are OK. I tried a couple of diffs for my SII GS, the best one came from a front axle with freewheel hubs because it had seen little use. Others were rust pitted (gears & bearings) or had a badly worn crownwheel & pinion.
I have a few spare axles and I need to check them out for a decent diff to go in my Series III. It howls on acceleration or deceleration but is quiet on a neutral throttle.
Hot hubs could be bearings too tight as Chops mentioned or brakes dragging slightly.
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
'58 Series II (sold)
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C
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