Re: overdrive questions (borg warner)
The pull cable operates a lever on the side of the overdrive housing. When operated it engages the over-run clutch. and puts the wheels in a free wheeling mode. It also sets up internal hardware to accept the solenoid pall when electrically operated.
When the pull cable is engaged you cannot back up. If attempted there is no damage done, you just don't go anywhere. An over-run clutch only works in the forward direction
With only the pull cable engaged you are not in overdrive until you power the solenoid. When both are engaged and you attempt to back up you can do damage to the overdrive depending on how aggressive is the attempt.
You can climb a grade in second gear overdrive when both the pull cable and the solenoid are activated. When coming down a grade remove power to the solenoid and deactivate the pull cable or the car will run away with you.
When you have fully digested the articles you have downloaded you will see that you can connect the solenoid power through the governor attached to the overdrive (if it was left in place by the person who modified the unit for a Model A). The governor is a simple switch that closes at about 25 mph and puts ground on a power relay to allow the solenoid to be powered. At speeds below 25 mph the switch opens and drops the solenoid out. This does two things for you. It prevents you from backing up with the overdrive fully engaged. It prevents your battery from running down if you park the car and forget to turn the solenoid switch off.
Tom Endy
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