S3-3-4781X – Slip Yoke – 1350 Series – 1.500″ Splines Dia – Center U Joint To End 7.312

Spline geometry is the defining characteristic of a slip yoke, and the S3-3-4781X is precisely machined to 14/16-spline, 1.500" specifications for the 1350 series driveshaft. Correct spline engagement ensures full torque transfer with minimal backlash throughout the operating range.

Spline Engineering

Involute spline profiles, standard in automotive drivelines, distribute torque across all spline teeth simultaneously. The 14/16 teeth of the S3-3-4781X provide adequate torque capacity for 1350 series loads while maintaining sufficient tooth thickness for long service life. Spline diameter of 1.500" is the pitch diameter reference -- verify this matches your transmission shaft specification before ordering.

Dimensional Data

Sliding Surface and Seal Considerations

The portion of the S3-3-4781X that slides through the transmission extension housing seal must be ground to a smooth, consistent finish. Surface roughness above Ra 32 will cut through the seal lip prematurely, resulting in fluid loss. Universal Driveshafts sources slip yokes with controlled surface finish on the seal contact area to prevent this failure mode.

Maintenance and Inspection

• Inspect the yoke sliding surface for grooves, pitting, or corrosion at each driveshaft service
• Light surface rust can be polished away; deep scoring requires replacement
• Check spline condition: tooth flanks should show even contact, no brinneling
• Verify the companion U-joint cross and snap rings are also in serviceable condition
• Apply a thin coat of lithium grease to splines before reassembly

Ordering

The S3-3-4781X is a stocking item at Universal Driveshafts. We carry the full 1350 series lineup -- matching crosses, yokes, and flanges. Call or email our driveline team with your vehicle details for confirmation before ordering.