To ensure reliability, purchase GM part # 12549405 Ring,1st Gear Blocking. It is sometimes referred to as GMC Synchronizer Ring. 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 Jimmy, Sonoma models.
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