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I had one (non lock up, 16930) in my old GN. It was a great converter, very efficient. I picked up 7mph in the quarter over the pro-torque that I had in the car prior to the Art Carr.
My buddy also has one in his GN and he likes it a lot... I hear that there was a period that they had a downhill slope but they're better again... I would maybe see how much they would charge for a washout and refresh... Just to be sure you know..