1992 Geo Tracker!

So I have a 1992 Geo Tracker ( automatic, 3spd, 4×4 ), and the transmission went out…. and lets just say the “mechanic” let his cousin work on it, and it took me 6 months to get it back… I got it back in pieces. I know the engine is good. But I look everywhere and I cannot find this transmission for sale anywhere!! I bought one from ebay a while back before I took it to the “mechanic” but they sent me a 1995 5spd I believe. I was just wondering if anyone knew what type of transmission could possibly fit or be jerry rigged to fit. Thanks for stopping by! Let me know your ideas. I plan to salvage yard shop as soon as Finals week is over