DUST CAP KIT D3K

DUST CAP KIT D3K 1410 Series Splined Dust Cap Kit

The DUST CAP KIT D3K is a 1410 series splined dust cap kit designed to seal the spline bore of a slip yoke or stub shaft against contamination. It fits over the external spline profile at the entry point of the slip joint, with an inside diameter of 1.779" (R-type) and dual seal outer diameters of 1.750" and 1.500". The 16-spline engagement profile corresponds to the 1410 series driveshaft slip arrangement.

The D3K kit is catalogued for splined applications only — it is not a press-on smooth-bore cap. The inside diameter is listed as 1.779-R, where the "R" suffix denotes a ribbed or radius-profile bore that conforms to the spline crests rather than riding on a smooth journal. The dual seal OD specification of 1.750/1.500 indicates a two-diameter stepped seal face: the outer lip seals against the 1.750" housing register while the inner lip contacts the 1.500" bore shoulder. This two-lip geometry is common on heavy-duty slip yoke assemblies where a single seal face is insufficient to exclude road debris. The 16-spline count must match the stop shaft profile exactly — a 13-spline or 10-spline shaft will not engage this cap correctly and will allow contaminants past the seal barrier.

Specifications

• Part Number: DUST CAP KIT D3K
• Series: 1410
• Type: Splined
• Inside Diameter: 1.779-R
• Seal OD: 1.750 / 1.500
• Spline Count: 16

Fitment & Installation Notes

Before ordering the DUST CAP KIT D3K, verify the spline count on the existing stub shaft or slip yoke. The 16-spline count is associated with specific 1410 series slip yoke configurations — if your assembly runs a different spline count, this cap will not seat correctly. Confirm the housing register diameter accommodates the 1.750" outer seal lip before pressing the cap into place; an undersized housing bore will prevent full seating and allow the cap to work loose under vibration.

The 1410 series sits above 1350 in the torque capacity hierarchy and is common on 3/4-ton and 1-ton pickups, medium-duty trucks, and heavy-duty light commercial applications. The wider U-joint cap width (4.188") compared to 1350 series distributes bearing load over a greater area, which is why 1410 is the preferred series for towing and off-road applications that cycle the driveshaft repeatedly through high angles. Dust caps on 1410 assemblies are critical maintenance items — a missing or split cap allows spline corrosion that can seize the slip joint and cause vibration or complete driveshaft failure.

Inspect the spline bore for corrosion or galling before installing the DUST CAP KIT D3K. If the spline crests show raised material from prior cap wear, dress the splines with a fine file before fitting the new cap. Repack the spline bore with chassis grease at installation to extend cap service life. Explore related Slip Yoke components including 1410 series slip yokes compatible with this dust cap configuration.