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Originally Posted by TTS
This conversation has been about a TH400 and it's braking, correct?
D3 gear ratio is 1:1. How can high gear provide braking? The braking is in the differential- not the transmission.
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Perhaps we're suffering from a terminology problem. If the transmission is engaged and I'm travelling at a high rate of speed and let off the throttle then the compression of the engine will drag the car's speed down faster than if the transmission was in neutral or freewheeling, disengaging the engine from the drivetrain. This is what I'm calling engine braking, and is the same thing that happens in lower gears only it's more pronounced because of the gear reduction in the transmission that causes the engine to spin faster for any given speed.
I have never owned and automatic transmission vehicle, whether with a TH400 or whatever that disengaged the transmission whe you let off the throttle in D.