Whats your preferences on limited slips in differentials ? I'am trying to figure out ways of increasing the traction on a older F-Superduty F-450 which is a 2wd. I thought about going with a locker but I have been told I may end up breaking the rear end with the loads I carry. These trucks have a Dana 80 with 5:13s so I need one that will work with 5:13 ring and pinion. As for tires I'am I better off using a full out mud tire for drives or should I use a traction tire like the BFG Commercial T/A. I never put mud tires on the drive tires on a dually I don't know how much noise they would produce or how fast would they peal off. I thought about going back to a F-350 so I can have 4wheeldrive but the "legal Payload" will be 4500lbs which is all what a F-350 can really carry. Legal payload on a F-Superduty is 7000lbs a big difference when the brakes are designed to stop a 15,000lb gvw truck over a F-350 which has a gvw of 11,000lbs.