I have no clue. But I had the full-time 4x4 and it shuttered on the pavement from side to side. I don't know if that was from the 4x4 or my 27" tires. But I had a 424 Select on there for 5 months and I never had no problem. I'd recommend the Warn 424 Select to anyone for a full time 4x4 ATV.