I was driving my 1990 350SDL and the automatic transmission would not shift from first gear to the higher gears. It seemed to be trying to change gears but it felt like it was slipping and just couldn't do it I checked the transmission fluid and it was full. I was about 70 miles from home and had to have the vehicle towed- since the car could not be driven on the highway and started to overheat at 20 MPH. Is there a possibility that the transmission screen is dirty and needs to be changed - I had this problem with a 300SD and changing the screen solved the problem.

The 350SDL has been given all routine maintenance and has about 120,000 miles on it. This car is just like new and prior to this incident it was just as tight as can be and ran like it was new.

Any suggestions would be appreciated.

thank you,

Marvin Smith