Hmmm, torque converter lockup is only in 3rd 4th and 5th gears. If it will do it in all gears including 1st and 2nd, the lockup clutch may not be your problem. I believe a lot of transmission controllers were replaced under warranty for the 97 model years if there was a problem that was brought to the dealer.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record