Just wanted to mention that I had this swap (4 to 5-speed) done with my '89 Colt back in '95. Car had 160k on it at the time and started popping out of gear. I was able to hold it in gear manually for about two months or so, but after that I started looking for a replacement tranny. Dealer told me it HAD TO BE a 4-speed for my '89. Junkyard told me they had a 4-speed in stock, but when I got there (3 hours of driving each way), it was a 5-speed instead. Dealership in the area of the junkyard looked at the microfiche and told me the 5-speed would work, so I bought it (along with all the cabling) for $300. Gave the whole mess to a tranny shop and it was done the next day. When I went to pick up the car, the tranny guy handed me back the "new" cables saying he didn't need them (the existing cables worked just fine). He never mentioned anything about changing any brackets, either. From all accounts, it was "plug-n-play". Never changed the computer, either. The car ran 7 more years and 90k more miles without any issues. I THINK I remember the guy at the Dodge dealership saying the tranny case for the 5-speed was a little bit longer, but I was never able to put the two side-by-side, so I don't know if this was in fact true...
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