G101531 Case 450 455 550 series 38 spline bull gear. The G101531 38 spline bull gear fits the following Case crawler tractors: 450, 450B, 450C, 455B, 455C, 550, 550E, 550G & 550H. For the 450, 450B & 455B tractors that use the 33 spline sprocket shaft, use part # A50214.


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