Re: How many different 42 RE transmisions are there?
Don't know if this helps, but this is what i found on the net:
The Jeep 42RE automatic transmission is a descendant of Chrysler's Torqueflite 727 transmission and directly related to the A500 light-to-medium-duty Chrysler truck transmissions. The 42RE was first used in Jeep Cherokee vehicles in late 1993, until it was replaced by the 42RLE in 2004. It is a four speed, automatic overdrive, electronically controlled transmission, which differs from the 42RH transmission because of the hydraulic control. You can identify the transmission with visual clues and by locating the model/part numbers and the date code.