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My OD kicks in about 40mph on level road. It drops out when the car slows down below 35mph +/-.
The horsepower curve is pretty steep at the lower rpms, so I think that the horsepower available at the 1500rpm minus 31%, even with a 3.73 rear axle ratio, is low enough to seriously lug the engine.
The old original overdrive units, my family had one on our 1950 Mercury, was a manually engaged (T-handle under dash) and had free-wheeling. When you backed off on the gas, you were in neutral, coasting along. Aah, technology!
Regards,
Bob
:>)
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