I have a John Deere 36" belt WB. I use a velke about half the time, but I feel like it strains an aweful lot and doesn't cut as well so I walk when I can. My problem is this...2nd gear is too slow and 3rd gear is too fast. I have no idea why there is such a gap, but it's ridiculously far apart. I have heard you can change the pulley and belt size to adjust this. Does that make sense? What else can I do? Any suggestions would be appreciated. By the way, it has a 13hp kohler engine.