there are a lot of places that sell master rebuilds....
How much metal? It is normal to have some metal stuck to the magnet. Also. are you sure it is the diff that is making noise? It could be a wheel bearing.
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2008 KK Liberty Sport NIGHT OPS EDITION + GILLS
OEM & Custom Skids - Factory Tow Package - Rock Lizard Skink Super Sliders
Prototype JBA 4 Inch Lift - JBA UCA's - Flowmaster Super 44 OR - Whacked Resonator
Jet Stage 2 - RL Gecko Basket Rack - Custom Winch Bumper - Recon 10.5K Winch