As you have probably learned, there is nothing sealed about this transmission except the manufacturer recommendation. There are drain plugs on both the pan and torque converter in that year as well as a replaceable transmission filter. The adaptation values of the transmission can be checked with the appropriate scanner.

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Ali Al-Chalabi

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