It "chugs" or takes a second to engage when putting in reverse.
No problems at all going forward.

Love my '91 560 SEL and do not want to have to change or replace it .
I brought it to a shop in Cape Coral Fl where I live and the owner said the tranny was "shot"

I asked him how much life was left in it and his reply was " 5 weeks or even 5 years