here is what it resulted
VIN WDB1240301B440468
Model 300 E
Chassis 1240301B440468
Engine 103983 10 041321
Transmission 717433 01 776196
Order 0 0 221 07591
Approx. year 1990

the older axle ratio was a 2.65 if i do remember well
Might the speedo be the problem?
I noticed another thing...near the automatic shifter there is the E and S slider button.
well it seems my car doesnt do any difference if it is setted to E which stands for economy or S which stands for standard i think! what about that? how is that supposed to work?