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If you have a standard differential, such as eaton, spicer, or rockwell, get the part numbers for your rear end (they are on a little tag attached to the housing or a bolt holding the differential to the housing.) take them down to your local heavy truck dealer, or if your lucky, your local heavy truck parts dealer and have them match your part numbers up to what is available.
A set of differential gears is a lot cheaper than having a whole rear end yanked and replaced at the nearest high dollar repair shop.