Late shifts after new torque converter.

George Jets said
I agree with this ^^^^ d55dave, all except the tying the kickdown arm forward part.

Heard of people ruining their transmissions by doing this because there is no pressure there to engage the clutches.

The kickdown (pressure valve) increases the internal pressure to keep the clutches engaged as the engine rpm and power goes up as the throttle is opening.
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Yes, I would only suggest it for one gingerly drive around the block to see what the shift points are. Really, it is no different than driving the car at or just off idle and letting it go through the gears. Damage happens at higher power settings without the TV hooked up.