The Dana Spicer 6.5-53-21 (also referenced as 6.5-53-21X) is a splined midship tube shaft and drive shaft stub shaft component. Specifications Part Number: Spicer 6.5-53-21 (Obsolete from the manufacturer) Spline Count & Size: 16 spline, 2.350" diameter (2.350 x 16) Bearing Diameter: 2.362" Tube Size: 3.500" diameter x .188" wall size Spline Length: 2.750" Thread Size: 1.250-18 Cross References: Mack 2104-655321, Freightliner SP6.55321, Newstar S-F315 / SD-6.5-53-21
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