To ensure reliability, purchase GM part # 3984818 Washer,Differential Pinion Gear Thrust. It is sometimes referred to as GM Pinion Washer. 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 Buick Electra, Lesabre, Regal models. It fits Cadillac Brougham, Deville, Escalade. It also fits Chevrolet Blazer, Silverado, Tahoe. This also fits GMC Sierra, Suburban, Yukon.
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