-Coated wheel bearings
-Ball bearing rear wheel bearings.
-Circular cross section disk piston seals. Retracts better than stock square cross section.
-Don't use grease in front wheel bearings. Fill with Justice Brothers Heavy Duty Vehicle, sealed dust cap and add fill hole in center with tiny air hole. Must check on regular basis. You would be surprised at the difference this makes.
-Polished ring and pinion gear faces.