Re: Model A in the mountains
Most of the time around town I leave it out of overdrive and just use the three standard gears. If I go onto a road where I can travel above 45 I shift into high gear overdrive. Certainly on a freeway or interstate I travel in high gear overdrive if the terain is level and the wind is not blowing at me. Climbing a steep grade I shift into second gear overdrive if I am losing it in high gear. My Ryan is a 23% and the differential gears are 378. I believe the Mitchells are 26%. In either case you want to be doing above 45 to use the overdrive in high gear.
I don't think anyone runs through the six gears when driving.
The Borg Warner overdrives are mostly 33% and they tend to lug the engine unless you have a 411 differenhtial. You certainly do not want to be in overdrive coming down a grade with a Borg Warner as they have an over run clutch and you will not have engine braking.
Tom Endy
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