MB didn't start using "lock-up" converters untill they introduced the 722.6 electronic transmission in 1996 on V-8/12 engines. IN 1997 all cars in the USA had that trans & converter.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator