To ensure reliability, purchase GM part # 12587621 Seal,Crankshaft Rear Oil. It is sometimes referred to as Chevrolet Crankshaft Seal. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Chevrolet Avalanche, Express, Silverado models.
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