Any three cylinder transmission will work in your car, if it's the wrong ratio the engine will turn higher or lower rpms but nothing unusable. That 93 most likely has the exact same transmission as yours. A convertible or a 95 and up three cylinder will have the 4.39, you'll get much better acceleration and poorer mileage. An XFI will have the 3.79, sluggish acceleration and better mileage. The vast majority of 89 - 94 three cylinders had the gears you have now. Go get that $70 tranny and spend an afternoon plugging it in. If the second gear synchronizer is weak (a very likely possiblility) or the gears are way out of wack, get yours rebuilt and spend another afternoon putting it back. No matter what you do, put 2.5 quarts of Pennsoil Synchromesh in it, that's the best stuff for the synchronizers and mileage.