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Mine has almost 300k on it. The last time I had it out was in 2000 when I had to have it rebuilt. Cracked tooth on the ring gear. Had to replace the input shaft about 2 years before that. I had all new bearings put in it on the rebuild. I went with the SWEPCO synthetic gear oil. Still had to put some limited slip additive in it though. Unless you're having any problems with it other than a leaky seal, I'd drain the oil and go with some fresh.
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