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Old 02-21-2011, 01:41 PM   #6 (permalink)
lurker's apprentice
Join Date: May 2008
Location: the Perimeter
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PlainJane - '12 Toyota Tacoma Base 4WD Access Cab
90 day: 20.98 mpg (US)
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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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