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I'll tell you exactly what it is. When you shift into first at that speed, you engage the lockup converter, and the surge you feel at 10 mph is when the TCU has to take pressure off the lockup converter in order to unlock it. Shifting into first at that speed is hard on the trans, and I wouldn't recommend it. 10 mph is when the speed of the car starts to slow down the engine below a preset point, so the TCU commands the lockup converter to disengage.
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