1979-2019 9.25 in/GM 9.5 in Limited Slip Differential 33 Spline (YDGGM9.5-33-1)Yukon recommends the use of high grade Non Synthetic GL 5 gear oil and Yukon LSD (Limited Slip Differential) additive for long life and smooth operation. Part number OILADD. The use of synthetic oil is not recommended and may result in aggressive or noisy operation. Features 9. 5" GM 33spl DURAGRIP POSITRACTION, COMPOSITE CLUTCH (needs2additives!) Fits 9. 5" GM differential 2. 440" deck height All units are backed by extensive product testing and
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