Thats sounds like how my gearbox wnet and it was the torque convertor breaking up, not cheap, quick fix go to merc dealer buy new gearbox filter £7.50 drain gearbox oil, remove sump 6 screws, pull of old filter fit new filter and refit sump stick in exact amount of oil as you removed not the old stuff new cheap atf 3 will do for this test then try to drive it.
This kept mine running for another month or so whilst i hummed and arrred deciding what to do.
Approx 3.5 litres of oil buy in 5 litre can for approx £20.
Lynall
This kept mine running for another month or so whilst i hummed and arrred deciding what to do.
Approx 3.5 litres of oil buy in 5 litre can for approx £20.
Lynall