To ensure reliability, purchase Infiniti part # 38421-S9120 Case-Differential. It is sometimes referred to as Infiniti Differential. You have nothing to worry about if you choose OEM parts as they are the optimal you can get in terms of quality and longevity. This is because they are precisely-engineered with the meticulous specifications of the official factory. They have passed strict quality control tests during manufacturing, so you know they're durable and sure to fit. This part fits 1997-2003 Infiniti QX4.
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