I got my replacement used diff from Potomac German Auto. They give you a warranty on the used stuff. Not a bad price either. I decided to go with the same gear ratio as the original. Maybe I should have gotten the 2.88 they did have one.

My dealership uses Potomac German. They are really reliable for used parts.

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup