Product Description: Fitment:Replacement for Chevy C10 1980-1986Replacement for Chevy C10 Suburban 1980-1986Replacement for Chevy C20 1980-1986Replacement for Chevy C20 Suburban 1980-1986Replacement for Chevy C30 1980-1986Replacement for Chevy K5 Blazer 1980-1982Replacement for Chevy R10 1987Replacement for Chevy R10 Suburban 1987-1988Replacement for Chevy R1500 Suburban 1989-1991Replacement for Chevy R20 1987-1988Replacement for Chevy R20 Suburban 1987-1988Replacement for Chevy R2500 1989Replacement for Chevy R2500 Suburban 1989-1991Replacement for Chevy R30 1987-1988Replacement for Chevy R3500 1989-1991Replacement for GMC C1500 1980-1986Replacement for GMC C1500 Suburban 1980-1986Replacement for GMC C2500 1980-1986Replacement for GMC C2500 Suburban 1980-1986Replacement for GMC C3500 1980-1986Replacement for GMC Jimmy 1980-1982Replacement for GMC R1500 1987Replacement for GMC R1500 Suburban 1987-1991Replacement for GMC R2500 1987-1989Replacement for GMC R2500 Suburban 1987-1991Replacement for GMC R3500 1987-1991Specifications:Hose Port Type: O-RingInput Shaft Spline Count: 25 + Flat & GrooveInput Shaft Diameter (in): 0.73Input Shaft Type: Splined, Single FlatNumber of Mounting Holes: 4Output Shaft Diameter (in): 1.25Pressure Port Thread Size: M18 x 1.5Return Port Thread Size: M16 x 1.5Total Turns Lock to Lock: 3.4