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MG MGB Technical - Transmission interlock switch

I have a 1979 MGB without a OD switch. SO I assume I do not have a OD trany. Are the Transmission interlock switch and solenoid part of the OD system. As I mentioned in my other post I am rewiring this car and I need some clarification on this issue.


Thanks
Bob
bsf Fowler

Without OD you will have a green and a green/black wire to the trans, if you have OD there will also be a yellow/red wire to the trans harness.
The switch is installed on the trans control extension across from the backup lamp switch. The solenoid is in the overdrive unit.
John H

A 79 should have the lockout switch as from 76 it was used to limit the vacuum advance to 4th gear only, as well as the OD. Also on a 79 the OD manual switch would have been on the gear knob and not a column stalk (which were fitted to earlier cars whether they had OD or not). The only real way to tell if you have OD or not is look underneath, and even then if there is no manual switch evident it may be because it doesn't work anyway and the PO fitted an earlier knob. Whether you have a manual switch, OD harness, lockout switch, or OD depends on what successive POs have done, you could have all, none, or a combination of any of them. The most dangerous is when the PO has added the OD unit but not the lockout switch.
Paul Hunt 2

This thread was discussed between 16/01/2006 and 17/01/2006

MG MGB Technical index

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