2-3-1210KX Slip Yoke 1210 Series , 27×68 series, Splines: 1.250×16 , Centerline To End: 8.016 Inch

2-3-1210KX Spicer 1210 Series Slip Yoke — 1.250"×16 Spline, 8.016" Center-to-End

The 2-3-1210KX is a Spicer 1210 series driveshaft slip yoke with a 1.250-inch spline diameter and 16-spline internal profile. The "KX" suffix in Spicer nomenclature denotes a greaseable design with a zerk fitting, which allows periodic lubrication of the spline interface — critical for extended service life on applications where the slip yoke sees frequent axial movement. The splined bore slides over the external splines of the stop shaft welded to the front section of the driveshaft tube, and the 8.016-inch dimension measured from the U-joint centerline to the open end of the yoke establishes the available engagement depth and the collapsed length of the driveshaft assembly.

The 1.250×16 spline specification defines both the pitch diameter of the spline bore (1.250 inches) and the number of involute spline teeth (16). Both dimensions must match the stop shaft exactly: a stop shaft with a 1.250-inch diameter but 13 splines is physically incompatible with the 16-spline bore of the 2-3-1210KX — the teeth will not mesh and the yoke will not slide onto the shaft. Conversely, a stop shaft with 16 splines at 1.210 inches diameter will feel loose in the bore and will generate vibration under torque load. The 1210 series sits at the lower end of Spicer's torque capacity range, designed for light-duty passenger car and compact truck applications. This series handles lower peak torque than the 1310 (which uses the same 1.062-inch U-joint cap diameter but is a physically different yoke series) and is not a torque-equivalent substitute in 1310 applications. The 8.016-inch center-to-end dimension controls how much of the stop shaft engages the spline bore at minimum and maximum suspension travel; on a typical light-duty two-piece or single-piece driveshaft, verify that the yoke remains on the stop shaft by at least 1.5 inches of spline engagement at full suspension droop.

Specifications

• Part Number: 2-3-1210KX
• Brand: Spicer (Dana)
• Series: 1210
• Spline Diameter: 1.250"
• Spline Count: 16
• Center U-Joint to End (CJ-to-End): 8.016"
• Lube Type: Greaseable (KX — zerk fitting)

Fitment & Installation Notes

Before ordering the 2-3-1210KX, count the external splines on the stop shaft and measure the pitch diameter using a thread wire set or vernier caliper. Confirm 16 splines at 1.250 inches. One additional or missing spline tooth makes the yoke physically incompatible. Next, measure the overall collapsed length of the driveshaft when the suspension is at full droop and confirm the 8.016-inch CJ-to-end dimension leaves adequate engagement on the stop shaft. The minimum recommended engagement is typically 1.5 inches of full spline contact; calculate this based on your specific driveshaft geometry.

The 1210 series occupies the light-duty tier of Spicer's driveline hierarchy — below the 1310, 1330, 1350, and higher series. It is found primarily in passenger cars, small trucks, and compact SUVs with inline four-cylinder or small-displacement V6 powerplants where drivetrain torque loads are moderate. Upgrading to a 1310 series slip yoke requires a stop shaft machined or welded for 1310 spline specifications (typically 1.375-inch diameter, 16 splines) and a 1310-ear driveshaft tube assembly — the two series are not interchangeable with the same stop shaft. Grease the spline bore of the 2-3-1210KX at the zerk fitting during installation and at each subsequent service interval to prevent fretting corrosion between the spline flanks, which is the primary failure mode on this style of joint. No published cross-reference to a Neapco or Meritor part number was identified for this SKU; verify spline specifications against the stop shaft on the vehicle before ordering.

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