To ensure reliability, purchase GM part # 12386154 Seal,Transfer Case Selector Switch (O Ring). It is sometimes referred to as GMC Transmission Gasket. 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 GMC Sierra, Suburban, Yukon models.
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