I have all three sets for my 4.0, the dog bones are best but wear out fast. But they work the best. The new driveshafts in the tuning kit are really good in bumps and hold up the best but are expensive and u can’t use the boots. The stock 4.0 shafts have to have that collar to use the boots and they are different then the 3.0. the boots are not an improvement because they slow down your drivetrain a little.