First thing low fluid in trans. Uses DEXTRON like any GM car. 2nd thing the shift linkage under the car has missing bushings. 3rd thing completely blocked trans filter. 4th thing internally failed transmission

__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.