A couple years ago I had a customer who had 2 2001 9750's and a 2004 9860 with high unload rate. Of course it drove the operators of the 9750's nuts that the 9860 could unload so much faster. They said I had to do something about it so I changed the unload drive sprockets on the 9750's from the factory 19 tooth to a 24 tooth, basically speeding it up 20%. They were very happy with the results and there have been no damaged parts from the modification, they just wear out chains about 1/3 faster. I make sure the vertical auger lower bearings and 90 degree gearbox in the elbow get greased more often and the chain tension is checked regularly. Since then I have done this simple mod to other 9750's, 9610's and 9600's and have had many happy customers. On a 9600/10 a 17 tooth sprocket is used so I install a 22 tooth. To change the sprocket I simply buy a $12 sprocket at the local ag parts store and get my machine shop cut the old sprocket off and weld the new one on for a cost of $30. Then just lengthen the chain accordingly (or cut a whole new one). I hope some of you will find this useful.