My aunt's 9900 series shuttle has a small gear ratio box right up at the right arm area on the fender the area is timing the gears are old and warm and it will not go in first third fifth whatever Sandra can I cut the front guard out or either make the teeth deeper within the gear ratio area so it will go into gear most tractors have an open range so when they wear out you can still get them in the gear this thing has a freaking 3 in area where you can go from first to second third to Fourth 56 and so on and it doesn't have enough room to get to the gear so can I cut that area out to where it will work properly