To add to the previous discussions I offer the following:
British Leyland Technical Service Bulletin # 75-D-5
Date: April, 1975 (GAJ-3/19/75)
Subject: Gearbox Lubrication
Models: MGB - MGB/GT
"Will service personnel please note that Hypoid SAE 90 oil has now been
approved for use in the gearbox on MG vehicles. This supersedes the
previous specification calling for engine oil, and is suitable for vehicles
equipped with or without overdrive."
Orin Harding - Greensboro, NC
('71 MGB Roadster - Early '74 MGB-GT - Late '74 MGB-GT - '79 MGB Roadster)
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