Good reputable rear axle manufacturers?

I have a 2003 Mercury Marauder (high performance Grand Marquis) 4.6L Modular DOHC V8. For the second time, I have to replace the rear axles. I tried a pair of Dorman axles because I was lead to believe they were made to be properly hardened so that the bearings wouldn't dig into and grind away at them, but obviously I was duped because I'm having that same problem again 30k miles later. I want to know of some manufacturers who make good, properly hardened axles for my car so I don't have this problem again. I already know of Moser, but I just want to know of any others on that kind of level so I have more options. Thanks.