Just got a used K20, has a th400/203. I already know the 203 growls in 4-HI.. when i got it and drove it over an hour home it shifter kinda hard (prolly because the vacume line & modulator input are plugged with mud ) but shifted good everytime.. I just went to go to the store and no matter what i couldnt get it to hit 3rd gear RPM's just scream in 2nd.. I dont see any wires coming off it so i dont think i have one of those lockups???