[coalminer]

I have done a transmission swap from the 4 speed to a 3 speed, there is no computer that controls the 3 speed transmission. Now both of the vehicles I was working on were 95's. When I did the swap, I had to change the wiring harness under the hood, I unplugged from the bulkhead connector, and went both ways unplugging everything and then putting the 3 speed harness back in, everything plugged in where it should have and everything works. I also changed the engine computer to the one that went with the 3 speed, I dont know if that was different than the one that was used on the 4 speed, but I figured since everything had to come out, I should change it. The only other item that was a little different was the linkage that goes from the throttle to the transmission, there is none on the 4 speed, so you have to take that off the 3 speed motor (not hard to do). The shifter cable was the same, along with the mounts, and the axles, the cooling lines fit also with no problems.

The transmission will work for sure, however I dont know about the wiring harness, if they were both from 92 to 95 you should be ok, but I am not sure about an 89 harness.