To ensure reliability, purchase GM part # 25978165 Differential Carrier Assembly (3.23 Ratio). It is sometimes referred to as Cadillac Differential. 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 Cadillac STS models.
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