This is good to know! Thanks for posting. What do you mean by overdriving? Smaller pulleys and speed it up a bit........CurtI've been running a 23hp Vanguard in my 4223 for 7 years and still on the same belts for both the snow caster and mowing deck. I overdrive both the deck and caster with modified drives. I feel my other tractor with an 18hp Onan actually puts out more potentially belt-breaking torque. This is more a from-the-seat observation from operating them over the years.