My 2003 E320 is juddering like hell and after reading various posts on this forum and many other forums I have decided to change torque converter and fluid. Radiator is Behr item therefore unsure if I have glycol problem or not. Juddering gets worse the hotter the weather or after any hard driving. My gut feeling is that fluid is breaking down under heat. Car has 140k on it and not sure if fluid ever changed. Located a torque converter off 56 plate car which I presume will be 7gTronic. Will this be compatible? If not does anyone know where I can get a recon torque from? Will fluid change alone make much difference?