1990 300SEL Transmission just quit

[lkurec]

Hello everybody !I owned this car for a little less than 2 years and put about 20k miles on it. It had some startingproblems but ran and shifted perfect after starting. Until the other day, when I drove to the grocerystore, only 1 mile from my house. It hesitated shifting up, but did so after getting of the gas a little. After parking the car and doing my shopping, I came back after about 20 minutes and started the car, now it would not move shifting it thru every gear. It didnt even pull a little bit.After having the fluid and filter changed the next day it is still not moving or pulling . It is hard for me to believe, that the transmission would just die like this without any previous trouble. What should I look for before replacing the transmission. Any advice will be greatly appreciated. Another Question, will a transmission from a 1992 300E [WDBEA30E4NB547024] fit my car[WDBCA25D4LA532057]?

Thank You and a happy New Year to everybody, Leo!