Quote:
Originally Posted by daveymc29
Sorry, no. I told the nice lady at the parts counter what I wanted and she handed it to me. Went home and installed it, tested as I thought it would, so I put it all together. I have done this on about five and possible six O/D's. Works well for me. I'm sure most parts houses have a selection of switches. I asked for one that would interrupt the circuit when the plunger is pushed into the switch and the circuit will be restored as soon as the plunger is allowed to push itself out of the switch body. (shifting the tanny into reverse pushes the plunger into the switch body, killing the circuit to the solenoid. Neutral or an gear other than reverse doesn't affect the circuit. My power source runs from the fuse directly to that switch, then on to the on/off control to the solenoid, thereby insuring there won't be a memory lapse of other reason for the solenoid to be powered when the tranny is in reverse, Works for me and Austin Healey, Triumph, Jaguar and Volvo that I am aware of. Probably on any vehicle with a Laycock de Normanville O/D.
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The question I would ask is how is this switch interfaced with a model A transmission shift mechanism. Is it attached to the shift top to be actuated by the 1st reverse fork operating shaft or is this even a model A transmission?
Lock out switches were common on the early Lincoln, Ford, and Mercury R10 overdrive transmissions but they were deleted in 1951.