So you got a good deal on a used 1995 transmission but you car is a 1994? Physically, it will bolt up. But the converter will not lock up without a simple electrical modification. The 1995 transmission has Pulse Width Modulation (PWM) converter lockup that the 94 lacks.
You will need..
1) A '95 computer, preferrably with your same options. I was lucky enough to find a non-tow pack 95 Roadmaster with electric fans and 2.56 rear. Same as my wagon.
2) A '95 Transmission connector or, if you can find them (2 different dealerships were no help) PCM pins. Getting a used connector with several pins in it seems to be a good option so you have spares for future mods. I was able to use 2 brown wires with connectors, the correct color that '95 pin "U" used.
3) A length of wire about 10ft, probably less, 18-22 guage should work fine.
4) Electrical connectors
The wire harness is lacking a single wire. Between pin "U" on the transmission electrical connector and pin "D6" on the BLUE PCM connector. The pins are the same in the PCM and trans connectors. The holes are there in both connectors (trans/PCM) just missing the pins/wire.
I bought a used '95 connector and I was going to cut and splice all the wires. I thought it would be a better idea to just add the 1 wire to the existing connector. I removed 2 pins together with the wires from the used connector. I chose the correct brown color. I clipped one into the PCM connector and one into the trans connector in the correct locations. The PCM holes are numbered. You want "6" in the BLUE connector.
If you're stealing the pin/wire from another trans connector you've got to take the face off. You can pop it off with a flathead or push the clips off from the back. The pins push OUT from the back toward the front of the connector.
There will be a lonely pin (bottom of connector in this pic) looking for it's connector mate named "U". The wire on a '95 is brown in color. (Take note that this is missing some pins that you will have, I already stole them for my other connectors.
There is a rubber plug on the back. Pry it out and poke a hole for the new wire. Insert the wire/pin into the connector, next to the lone pin. It will click into place.
Up top, the connector case unclips and you install the pin the same way. Connect a wire to it, run a wire down to your new pin "U" and hit the highway with your new Pulse Width Modulation converter lockup now functioning.
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