The MGB OD is a separate unit, a set of sun gears stuck between the tailshaft and the driveshaft. IIRC the gearbox itself has an entirely different (cast aluminum) transmission casing. (The one-piece cast aluminum case included the bell housing too - B's were pretty cool cars, from an engineering standpoint.) The OD works in 3rd and 4th gears with factory wiring, giving you 6 forward speeds total. You can easily disable the 3-4 limitation and get 8 speeds, but I'm not sure that would be of much value.
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