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I read in your profile that you car is an 89, for 93 and previous you must change out the gear on the tail shaft, only the 94-96 can be done with the programmer. I got me gears from Doug Rippie. They were a pain to get on because the new gear for the tail shaft is metal(original is plastic and just slides on).
I have a 6spd but I believe it is the same deal for the auto,, good luck