[rotorwrench]

The grounding action of the coil is momentary. It happens as the holding coil releases until it is fully released and opens the ground contacts.

The balk ring will not allow the overdrive pawl to engage unless the throttle is released which will then let the pawl go into the notch and lock the sun gear. The balk ring has to have some friction between it and the sun gear plate or it won't shift in. If the car is off the ground there could be a problem with shift in but it should still work just watching the speedo until the governor speed it reached. Bypassing the governor will allow it to shift in at any speed but may need a bit of rpm to work better. Using a direct solenoid switch would bypass all this stuff including the function relay.

If the function is normal on these parts and it still starts making noise, you have a problem in the planetary. There should be no noise from the planetary after shift into overdrive.

All the Borg Warner R10 electric overdrives function in the same manner but there are a lot of case differences. The first Lincoln ones were even torque tube drive units. Some had different reverse lock outs and some have lock out switches & some don't. By 1955 they had simplified the units a lot more. No lock out switch (rail switch) was used after mid 1951 on Mercury cars and maybe earlier on ford cars.