Hey Les. Run a 930 series trans on my sons mower. I have stripped it, locked the diff, fitted bearings to the axle shaft ( none there from stock ) and filled it with gear oil to the base of the shifter shaft. It has 4 shifter keys. I run the trans in its stock location and chain drive from one end of the axle shaft to a separate solid axle mounted on cassette bearings above the trans to effectively lower the mower. I thought of flipping the trans but seemed too hard. It has done three race meets and so far so good. Hope this is of some help.
