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Ok, I wonder... since you bought this used... maybe the previous owner changed the diff, or diff fluid. Or maybe the diff fluid is just too thick for concrete. Concrete gets a boatload of traction, and having a diff with little to no give will do exactly what is happening to your rig. As for...

You wouldn't want aluminum for anything in the driveline of the RC. If you want to upgrade, get some MIP axles as I mentioned above. They will be bulletproof. You can however get aluminum carrier hubs here. They have other colors. One thing I would do if your bearings are ok is remove the hub...