2-4-3331 End Yoke – Splined Bore 1310 Series, Snap Ring Style, Splines 0.878 x 13

2-4-3331 Dana Spicer 1310 Series End Yoke — Splined Bore, 0.878" x 13 Splines, Snap Ring Style

The 2-4-3331 is a Dana Spicer 1310 Series end yoke with a splined bore, engineered to connect the driveshaft to a transmission output shaft, transfer case output, or differential pinion shaft carrying a 0.878" major diameter, 13-spline profile. Unlike a slip yoke, the 2-4-3331 is a fixed-length connection — it splines onto the shaft and is retained by a nut, providing a rigid coupling to the driveshaft U-joint. The cross-reference for this yoke is Neapco N2-4-3331.

The 2-4-3331 uses SR (Snap Ring) retention for the 1310 Series U-joint caps. The 1310 Series U-joint cap diameter is 1.062" with an overall width of 3.219"; the yoke ears are bored and grooved to accept these caps. Hub diameter of 2.000" controls the fit against the tail housing seal — the hub must pass through the seal lip cleanly without lateral play. The CJ-to-end dimension of 2.562" defines the distance from U-joint cross centerline to the end of the yoke bore. Through-hole dimension is 1.567". The spline bore is 0.878" major diameter, 13-spline involute profile; any shaft with a different spline count — even 12 or 14 splines — will not engage correctly.

Specifications

• Part Number: 2-4-3331
• Brand: Dana Spicer
• Series: 1310
• Bore Type: Splined
• Splines: 13
• Spline Diameter: 0.878"
• Hub Diameter: 2.000"
• CJ to End: 2.562"
• Through Hole: 1.567"
• Snap Ring Style: SR (Snap Ring)
• Cross Reference: Neapco N2-4-3331

Fitment & Installation Notes

Before installing the 2-4-3331, confirm the mating shaft carries exactly 13 splines at 0.878" major diameter — count the splines directly or consult the vehicle's driveline service manual. The 1310 Series is the standard U-joint series for light-duty and 1/2-ton truck applications. It is not interchangeable with 1330 Series hardware: both use the same 1.062" cap diameter, but the 1330 yoke ears are wider (3.625" span vs. 3.219") to accept the wider 1330 U-joint. Installing a 1330 U-joint into a 1310 yoke is not possible — the caps will not fully seat.

The 1310 Series sits mid-range in light-truck drivetrain applications and is catalogued on 1/2-ton pickups, SUVs, and passenger car applications across Ford, GM, and Chrysler platforms where 13-spline outputs are standard. If the application has been upgraded to a higher-torque drivetrain and the differential pinion now uses a 1350 Series U-joint, the yoke must be changed as well — a 1350 U-joint cap (1.188") will not fit the 1310-bored ears of the 2-4-3331. In that case, source a 1350 Series end yoke matched to the same 0.878"×13-spline shaft profile if available.

The 2-4-3331 is the direct Dana Spicer part number for this configuration. Neapco lists the equivalent as N2-4-3331. When substituting any cross-reference, verify the spline count (13), spline major diameter (0.878"), and hub diameter (2.000") against the receiving shaft and housing specifications. Explore related End Yoke components including round-bore and 1350 Series splined yokes for higher-torque driveline configurations.