I have driven a 1971 MGBGT for about 11 years now. I always engaged
the OD with the clutch engaged. If you will note the manual says
to never ever push the car backwards with the OD engaged. I took
the OD apart once and found some gears that rotate only one way.
Should a force be applied to reverse them, they would be destroyed.
So I guess if you were traveling at 55mph, disengaged the clutch
engaged the OD and released the clutch wo reving the engine, it might
put a reversing torque on those naughty gears.
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