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A bit more information is needed regarding the transmission. When does it happen? If you are in a gear and are completely stopped BEFORE you start to shift to another gear in the same range and you encounter grinding, quite possibly you have both a clutch problem and a synchronizer problem. If it never grinds when shifting to another gear within the range if you were first completely stopped before you left the original gear but it DOES grind if you select another gear within the range while moving, then it is likely just a synchronizer problem. If you are stopped before you leave the gear you were in (park does not count) and you leave the range to go to another range and you grind gears, it is likely a clutch problem. If you find yourself grinding gears as you shift from range to range and you are moving at the time (even slowly) that is normal. You should not be moving as you shift from range to range. These are constant mesh gear transmissions. If the tractor is moving then the bottom shaft (which gives you the different ranges) is rolling and the gears on it will be rolling at different speeds. As you shift throught the ranges(shifter lever in left side of shift quadrants) you will be trying to slide a collar locking two gears each rolling at different speeds, together. The top shaft which gives you the fast, slow and reverse gears within each range (gear shift lever to the right side of the quadrants) has the synchronizers on it. They do a good job of stoping the grinding (or at least minimizing it) unless they're worn and you're trying to shift quickly. Above I said something like 'just a synchronizer problem'. I don't mean to minimize that. Synchronizer repair/replacement is not cheap. Pay careful attention to when you experience gear crash and under what circumstances. They'll answer some questions. If you wind up in the transmission, would recommend you go through with a fine toothed comb. Repair, replace and adjust everything. Once done right, you're not likely to gbe back in there for a long time.
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