You'd be looking for an "M" code that would describe the trans (M01-M99,MA1-MY9) as you'd be looking for an "L" code for the engine. A few are as follows: M13=4T60-E, M30=4L60-E, M51=4L80-E, MN3,MN5=4T65-E.

Be careful as trans code has to match year, example... Login to read more.