Just Pulled out the Transmission

[BJH324JH]

All that gunk is mostly spent clutch disc material. A bit will be grease off the input shaft and the rest is moisture and whatever else has managed to find it's way into the bell housing over the last 3000 years. Unless you are seeing actual gearbox oil weeping somewhere, I'd be leaving the front seal alone. Your clutch cable could do with some adjustment but reverse in these transmissions is traditionally 'notchy'.

I just couldn't leave the twenty-nine year old gasket unchanged, so I ended up replacing it and cleaned up the front a bit. The small threaded hole is indeed there so that you can remove the part with ease. (Thank you Mitsubishi <3) Just simply get a bolt from the transmission and thread it in until you see the part slide out a bit, then carefully pull out the part the rest of the way out. It's basically the same thing as removing the drum brakes.