[Healeys] Overdrive fails to engage consistantly

[edic at tampabay.rr.com]

I am having an intermittent problem with my Overdrive and I need the wisdom of
this list. It seems to always go into overdrive when I first engage it, but
later on it will not engage. I suspect the problem is the overdrive inhibitor
switch. I believe this because, after a run when the overdrive didn't engage I
checked to see if the inhibitor would click with the key on, overdrive switch
engaged and the gear shift sliding over to 3rd and 4th neutral position. I
have only done this when the car was in the garage and have not pulled over to
see if it will click when the O/D has failed to engage. My question is, if my
inhibitor switch is faulty, are there any adjustment one can do, or is a
replacement in order? Or is there something else to consider? Up until
recently it has performed flawlessly.

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