Try a dealer (seriously). I called a local dealer trying to verify the PCM P/N in my '87 Dakota, and they found a couple of dealers in the region that still had them in stock (rebuilt, but OEM rebuilt).

 

I was going to suggest to find a van with the 5.2L but one with MT would be very rare if not impossible to find. I don't remember the last time I saw a van with MT. I also wondered if the electrical system in the full sized trucks changed to OBD2 with the new model intro in 1994?

At any rate I would try the 5.2L AT PCM and just tolerate the CEL if it does throw it. If you don't like it put a piece of black tape over the bulb?

Steve

 

Full size trucks went to OBDII in 96.