After installing a new drive belt and adjusting the clutch I discovered the small 90° drive under the shifter was no longer providing much output. In creeper I got it and the trailer full of leaves back to my shed so I work on it. The little unit is about 3.5 " on a side. My first question is how to disconnect it from the flex coupler that is connected to a short drive shaft to the engine's flex coupler? After I get it out I will search for a usable replacement. I got this tractor back in '78 when it had an exhaust blockage at my Mom's Tupperware warehouse. They bought a new one and she gave me this old one. I have a 2 acre lot and only use it to pull my cart and trailer to move stuff like leaves, mulch and firewood. This the first problem I have had since '87 so it has been a great little tractor. With chains on it I can pull full loads of firewood up my steep back yard grade which a smaller lawn mower couldn't handle. Greatly appreciate any info on how to remove this drive unit and replace it.