For many, replacing an axle seal or bearings does not happen until they fail and fluids are spilling out. Hopefully that isn't you, but regardless, Quadratec has plenty of seals and bearings for just about every Jeep and axle type.
No matter if your axles are from the Dana series or an AMC 20. Even a Chrysler 8.25. You can find new axle seals or axle bearings to replace those older and worn ones. This way, you can seal out dirt or mud and provide peace of mind knowing your front or rear axles won't have a more serious problem down the line from seal or bearing failure.