Yeah, study the transmission for a couple weeks prior and save pictures on your phone. Particularly the valve body check ball locations. And valve/spring orientations. It’s a piece of cake. If you can rebuild a carburetor. You can rebuild a transmission. Air tests will tell you everything that’s wrong or not concerning bands being applied correctly or not in reference to shifting problems. If you have slippage problems. Your clutch packs need replaced, bands need replaced or adjusted. Also fluid level may be incorrect.