I need your help guys,I recently got an engine for Toyota mark x 2005 model complete with a gear box.I replaced without seperating engine and transmission,I filled the transmission with dextrone ii drove it a day then parked it because the performance was bad. I then replaced the oil with Atf WS as toyota dealers advised.but still my transmission is not okay,when I push into D or R. There is not change felt, the car only moves when u accelerate. AT 80KM/H the engine check light comes ON,when it comes.It then moves at high reves.I need your help, before I changed the dextrone ii oil, the engine check light would come on at 40km/h