Spicer 2-3-8251X 1310 Series Transmission Slip Yoke (28-Spline, 1.500" Barrel Diameter)

Eliminate high-speed undercarriage shudder, stop transmission fluid leaks, and preserve smooth power delivery with this genuine Spicer 1310 Series Transmission Slip Yoke Assembly. Engineered as a high-durability, premium original equipment manufacturer (OEM) replacement component by Dana, this slip yoke (Part Number: 2-3-8251X) is built to withstand high rotational torque profiles across a massive selection of classic Ford muscle cars, hot rods, modern manual conversions, and light-duty trucks.

On rear-wheel-drive platforms, the transmission slip yoke slides directly over the transmission output shaft splines, plunging back and forth within the tailshaft housing to allow the driveshaft to adjust its length safely as the rear suspension articulates. Over high mileage, hard gear changes, or drag strip launches, the outer ground barrel of a factory yoke can develop deep ridges, scoring, or pitting from continuous friction against the tailshaft seal. This surface damage allows high-viscosity transmission fluid to weep past the lip seal, causing a persistent, messy undercarriage leak. Simultaneously, internal spline teeth wear introduces structural slop or backlash between the output shaft and the driveshaft, causing a rhythmic clicking sound when shifting into gear and an aggressive chassis vibration at highway speeds. Swapping out a loose or damaged component for an authentic Spicer forged steel yoke resolves this mechanical play and protects your extension housing bushings from catastrophic premature failure.

Precision-forged by Dana Spicer—the undisputed benchmark in global drivetrain technology—this slip yoke is machined from premium structural steel and induction-hardened for maximum shear resistance. It features a standard 28-spline internal layout (often designated as 27-spline based on standard spacing plus one wide blind spline gap) and a mirror-polished 1.500-inch ground hub diameter that provides a flawless, friction-free mating surface for your rear transmission seal. Measuring 6.50 inches from the centerline of the universal joint cross to the end of the barrel barrel, it is dimensioned explicitly to accept standard 1310 series universal joints using external outside snap rings. Sourcing this genuine OEM component ensures an exact factory press-fit that matches original driveline blueprints.

Component Highlights:

• Stops Extension Housing Leaks: Features a flawlessly ground, mirror-polished hub barrel finish to glide smoothly past your tailhousing seal without weeping fluid or damaging the rubber seal lip.

• Forged Structural Integrity: Fabricated from premium-grade structural steel alloy to maximize torque capacity and resist splitting or twisting under high-load acceleration.

• Classic 1310 Series Architecture: Engineered with precision-bored yoke ears tailored exclusively for standard 1310 series universal joints utilizing external outside snap rings.

• Flawless Rotational Balance: Machined to strict factory weight tolerances to completely eliminate undercarriage harmonics, protecting your internal tailshaft bushings from rotational runout.

Drivetrain & Fitment Specifications:

• Driveshaft Series: 1310 Series Architecture (3.219 in cap-to-cap width | 1.062 in bearing cap diameter).

• Spline Count & Design: 28-Spline (27 Splines plus 1 Wide Blind Space).

• Barrel Outer Diameter: 1.500 inches.

• Center-to-End Length: 6.500 inches.

• Approximate Ground Hub Length: 4.875 inches.

• Yoke Lock-Up Style: Outside Snap Ring (OSR).

• Compatible U-Joint Kits: Spicer 5-153X (Greaseable), 5-1310X (Non-Greaseable), or 5-3613X (Coated for Aluminum Shafts).

Common Transmission Fitments:

• Ford Automatic Gearboxes: Fits classic Ford C4 3-speed automatics and AOD (Automatic Overdrive Metric) transmissions utilizing a 1.5-inch sealing diameter.

• Ford Manual Gearboxes: Fits vintage Toploader 3 & 4-speed manuals, BorgWarner T-5 5-speed manuals, T-10 4-speeds, and aftermarket Tremec 3550 / TKO performance platforms.