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Dana type differentials are not the type you want to learn on without the help of someone who REALLY knows what they're doing. There are also some fairly specialized tools you should have so shims and new bearings are not destroyed in the process.
I seldom send my truck out for work, but I had to rebuild the rear differential last year. I went to Rears & Gears in Port Orchard, and they were great.[/quoteI second this suggestion