Mine had no ID on my Isuzu C240 powered Series III.
http://www.aulro.com/afvb/other-powe...ies-3-a-5.html starting about post #44
Seems that the ID was on the transfer and then it moved to the box (or t'other way round) so you can end up with a gearbox and transfer box with no number.
I'm fortunate that I can personally visit the parts supplier with the part I want in my hand.
Mine was a late box (ribbed casing) but earlier transfer box (small intermediate shaft).
Some of the early series III suffix's are listed here
Land Rover FAQ - Repair & Maintenance - Series - Chassis Numbers - Suffixes
Seems one item to check is the reverse ratio.
Ribs on B, C & D boxes Land Rover Owner • View topic - Gearbox suffix ?
I'm sure most parts supplier will provide some clues to help you identify which box you have.
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
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
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