Thanks for the posting bmaverick. I did empty the case of hydraulic oil then remove the filter screen and cleaned ....there was not a speck of junk on that screen when removed....remarkable. Anyway I did use SAE-30...thank you for that info by the way. Also the noise I have mentioned happens when the clutch is up (not pressed down)..shift stick for the C,1,2,3,4 gears is in neutral (no gear selected)....shift selector to the right is in N.....I still hear as though gears are turning underneath my seat area of the transmission case. Now, "if I press the clutch" all the way down it will stop that noise. One other note, even if I have the shift lever in N,1,2,3 or R ....while the shift stick is in N, I still hear it. Has this something to do with the throw out bearing or clutch plate rubbing on something? I'm thinking it is just barely touching where it engages? Just a thought.