The transmission is constantly changing, the most severe changes occured much earlier. The balancer definetly was changed by then and is cheap anyway.
I am currently looking to buy a E430 and I am looking at 00-01 cars. I have given no consideration to trans type or balancer, but I really wouldn't worry about any E430 trans and the balancer is $70 or so list. The numbers are easy to see on the balancer and if the last four didgets are 00 00 then change it. We did a 99 SL500 this week with a 00 00 and it was probably within days of coming apart. We were only there because of an alternator problem. he sure was lucky that alt took a dump.
Bosch Master, ASE Master, L1
33 years MB technician