King Quad tranny problems. Help please!
 

I have a 2000 king quad that has a shifting problem. The 1 through 5 gears work fine but it will only move in superlow. If i put it in low or high range it will not budge. With tranny in neutral it will move no matter what range its in. After taking it to a suzuki mech. and finding out it was gonna cost me 1300 to just tear it down i decided to figure it out myself. I have the gear case on the left side open and cant see anything obvious but I dont really know what to look for. Any help would be greatly appreciated.

Thanks