this post was submitted on 12 Jun 2024
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No, you can accelerate and deccelerate. Only needs to unlock for gear changes.
Only in city would the torque converter spend an appreciable amount of time unlocked but then again, in the city you won't be moving fast either
Neutral to one is a gear change and connecting gear one firmly to the motor is going to stall it when you're accelerating from standstill. With a petrol engine just the torque needed to get going is going to stall it that's why you slip the clutch with a manual, a trailer will also stall diesels.
With a torque converter in between you'll also have to let it slip as it's serving the function of a clutch. Trying to slip the lock of the converter will kill it pretty much instantly, it's not build for that so you have to have it unlocked.
I was interpreting "constant speed" as "zero speed difference between motor and drive train" which was probably a bit of a brain fart. You need that slippage to not stall the motor.