Try to only find peerless transmissions. Spicer/footes, and most other brands wont hold up and are practically crap. Most transaxles will bolt up the same say or have the same bolt pattern and if they don't it's simple to drill new holes or something to that nature. A peerless 600/820/930 etc would all be a good choice. A peerless 700 is for live axles if you want to start racing.