MGB 1973 Overdrive

When I engage the overdrive after starting to drive a cold engine and gear box car it works perfectly for a few miles until it disengages
itself as the gear box oil becomes hot. Cleaning the solenoid helps for a while but the problem persists. Any advice would be appreciated. David
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david wrote:

You may need to ohaul the OD unit and replace all the O'rings so that there is no pressure drop. You can also connect a pressure gauge to the OD and see what pressures its working at.
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