I have a Paragon box on my L120, and it works well, and has given extremely faithful service, but one thing I found was if the fluid gets low it makes a strange swooshing sound at power on, and also that if you don't screw the filler plug fully in after refilling, (just the thing one is tempted to do just to run the engine then check the level again, because it is quite long and tedious to screw right in, being quite a long bolt-like arrangement), the reverse does not work at all. So obviously it performs two functions - filler hole and the shaft closes off some kind of oil gallery. Anyone else have this type of tranny, or are they all Borg Warner Velvets over there...? I've never heard anyone on the forum mention a Paragon transmission.