You can upgrade the tires and wheels without changing the axle if you wish. There haven't been any reports of axle failures, Just tire problem. You would still have only a 3500lb weight limit but unless you plan to load heavy you may not need the 5000lb axle. A "search" should find everything you'll need to know.
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Frank
Former 2002 TM2619 Owner
2005 Toyota Tundra AC 4X2
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