I was out researching the TR6060 and ran across the links below. You will probably want to skip most of the first Video, he drags things out just a little but he does give reference to a solid solution to the 1-2 grind. The second is going through how the synchromesh synchros work. You'll see why the Synchromesh Sycnchros in the TR6060 need fluids with the breakaway properties of ATF due to the materials used on the bulk ring of the synchros. Finally the third link is the damage that occurs from grinding the gears.