Spicer 2-94-28X Driveshaft End Yoke U-Bolt Fastener Kit (1210 / 1310 / 1330 Series)

Secure your driveshaft universal joint, eliminate drivetrain clunking, and prevent high-speed on-road u-joint failures with this genuine Spicer Universal Joint End Yoke U-Bolt Kit. Engineered as a high-durability original equipment manufacturer (OEM) replacement hardware pack by Dana, this premium kit (Part Number: 2-94-28X) provides significantly higher clamping reliability than standard thin-gauge bearing straps.

On rear-wheel-drive and four-wheel-drive vehicles, the end yoke at the transmission, transfer case, or differential housing acts as the primary interface securing the spinning driveshaft. For yokes engineered with drilled through-holes rather than threaded blind holes, this U-bolt kit wraps around the universal joint bearing caps to lock them rigidly into the alignment saddles. Over years of hard off-road trail wheeling, heavy payload acceleration, or sudden torque spikes, factory fasteners can experience natural metal stretch, thread fatigue, or severe rust degradation. If your u-joint fasteners become loose, structural slop is immediately introduced into your driveline, causing a prominent clunking sound when shifting gears and an aggressive chassis shudder at highway speeds. Worse yet, reusing old, stretched hardware increases the risk of a fastener snapping, which can drop a spinning driveshaft at speed and cause catastrophic undercarriage damage. Sourcing a fresh, authentic Spicer hardware kit preserves factory clamping specifications.

Manufactured by Dana Spicer—the industry benchmark in global drivetrain engineering—this kit is forged from premium-grade structural alloy steel and heat-treated to maximize tensile strength. Designed to service one end yoke assembly, the kit features a 0.312-24 (5/16"-24 Fine Thread) profile and is precisely sized for a 1.416-inch center-to-center width to comfortably cradle 1.062-inch outer diameter bearing caps. It includes specialized lock nuts that resist backing off under extreme operating vibrations and temperature fluctuations. Whether you are swapping a pinion seal, upgrading to an aftermarket chromoly end yoke, or replacing a worn u-joint, installing brand-new OEM hardware guarantees total peace of mind on and off the road.

Kit Contents:

• (2) Genuine Spicer High-Tensile Steel U-Bolts

• (4) Lock Washers

• (4) Precision-Threaded Fine Hex Nuts

Kit Highlights:

• Superior Clamping Uniformity: Delivers a complete 180-degree wrap around the bearing cap, providing more consistent structural retention and less distortion risk than traditional stamped steel straps.

• Resists Vibrational Loosening: Packed with heavy-duty mechanical locking nuts engineered to hold their torque setting under relentless undercarriage resonance.

• Genuine Spicer OEM Forging: Fabricated with exact material densities and thread tolerances specified by original factory equipment blueprints.

• Universal Series Compatibility: Provides a direct drop-in fastening solution across a massive range of classic muscle cars, vintage hot rods, half-ton trucks, and 4x4 Jeep platforms running 1210, 1310, or 1330 series driveline configurations.

Drivetrain & Installation Specifications:

• Driveline Series Architecture: 1210 Series, 1310 Series (including SPL22), and 1330 Series (including SPL25).

• Target Bearing Cap Diameter: 1.062 inches (1.063" nominal).

• Centerline to Centerline Width: 1.416 inches.

• Thread Profile Diameter: 0.312-24 UNF (5/16" Fine Thread).

• Crucial Torque Specification: Professional installation requires tightening hex nuts evenly in an alternating pattern to exactly 14–17 lb-ft (19–23 N·m). Do not over-torque, as crushing the bearing cap will trap the internal needle rollers and cause rapid u-joint failure.