You may need to adjust the shift linkage for low gear. If your idle is too high it will grind also. I would imagine that the problem could possibly be the low gear engagement dog is worn. Check the play in the top of the case where the shift shafts exit. If there is play in the shafts this will also make the trans not shift. I realize that this is only my 2nd post here but I just rebuilt my 95 xplorer 400 trans and engine and these suggestions were given to me by a polaris mechanic. If you discover worn parts in your trans I have several xtra parts that may work for you.I just looked it up on YouTube yesterday for a 1998 xplorer. My wheeler will only go in to high,reverse doesn't even feel like it's there and low will just grind. So I assume it's the translation on mine. Are you having the same issues? I'm new to polaris just got mine two days ago.