$5,300 sounds like waaay too much.

I think a 722.6 can be rebuilt for around $3,000.

I believe dealers sell this transmissions rebuilt with 3 year warranties for about $3,500.

I'd go to a well-regarded independent that specializes in Mercedes for a more realistic quote.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".