Found the answer by searching some old threads in the Mitsubishi Tech section.

Quote
Originally posted by BigBlue on Nov. 12th 2002

OK, Mitsu. went to a "lock-up" converter in 'mid year' of 1990. To identify a lock-up vs. a non lock-up, you need to look at the 4th letter on the transmission case (which Mitsu. lists as model V4AW2). If the 4th digit is;
N = Non- lock-up converter
P = Lock-up converter
The serial number has 9 digits and is located on the left side (drivers) of transmission. It's riveted on to the transmission.
They call out the parts that are NOT INTERCHANGEALE as;
Torque converter
A/T oil pump body
Oil Pump inner gear
Oil Pump outer gear
It goes on to say that many parts are interchangeable.

89 Raider - V6, Automatic, rear LSD, A/C Retrofit, Cruise Control Retrofit.