Ok everyone I will try to include all needed information and make this as short as possible. I am aiming to get some technical information to repair me jeep. Make:Jeep Model: XJ Cherokee Classic Year: 1998 Automatic transmission 4wd stock everything besides a 3" spacer/shackle lift kit and 31's I am getting multiple diagnostic trouble codes but the codes in question are as follows: P0740 Torque Converter Clutch Circuit P1899 P18XX Manufacturer Controlled Transmission I have a used transmission that I am getting ready to swap in but i don't know if i am wasting my time. I just want to make sure that I'm not wasting my time swapping in the "new" one. I got the jeep for a good deal and i just picked up the transmission for pretty good deal too. I just have to wrestle it all in now i guess. just seeing if some one knows that the solution i am trying will fix my problem or not.