I purchased a Toro Proline 36" belt drive, fixed deck from a member here. One thing I have always hated about the belt 36's is that they put small tires on them despite the fact they only weigh about 50lbs less than the hydro versions which get larger (16x6.5x8) tires. So, I found the largest tire Carlisle makes that goes on a 6" rim. This, of course, makes the mower go faster in the same geer. I used to do most mowing in 3rd, and large flat areas in 4th, but now I am down to 2nd and 3rd. Is there a way to take the tranny apart and drop the ratios so I can use 4th (and even 5th) again?