Spicer 5-648X 1330 to 1350 Series Greaseable Conversion Universal Joint (OSR Style)

Seamlessly adapt, upgrade, or repair your custom driveline with this genuine Spicer 5-648X 1330 to 1350 Series Conversion Universal Joint. Specifically engineered as a high-durability original equipment manufacturer (OEM) specialty component, this Outside Snap Ring (OSR) combination joint is designed to safely bridge the gap between a standard 1330 Series driveline yoke and a heavy-duty 1350 Series component without requiring an expensive custom driveshaft modification.

When performing axle swaps, upgrading to a higher-capacity transmission, or installing a performance transfer case, builders frequently encounter mismatched yoke dimensions. The 1330 and 1350 series share the exact same overall cap-to-cap width (3.625 inches), but they utilize different bearing cup diameters. This premium conversion cross solves the fitment dilemma perfectly: two opposing journals are machined to 1330 specifications with 1.062-inch caps, while the remaining two journals match heavy-duty 1350 specifications with larger 1.188-inch caps. Instead of compromising structural integrity with cheap, unbranded generic adapters, installing a genuine Spicer conversion joint ensures flawless, high-torque power transfer that eliminates driveshaft vibration and high-speed driveline bind.

Manufactured by Dana Spicer, the undisputed global benchmark in drivetrain engineering, the 5-648X is built with a solid, cold-formed steel body for extreme wear resistance and exceptional torsional rigidity under load. Unlike sealed life-series alternatives, this classic conversion joint is fully greaseable, featuring an integrated side-cross grease zerk fitting that allows you to flush out trail contaminants and inject fresh synthetic lubrication during routine maintenance intervals. Precision-ground and case-hardened bearing cups house high-density needle rollers and specialized multi-lip elastomeric seals to lock grease in while permanently sealing out deep mud, water, road brine, and trail grit.

Kit Contents:

• (1) Genuine Spicer 1330 to 1350 Series Conversion Universal Joint Cross

• (2) 1330 Series Precision Ground Bearing Caps (1.062" Diameter)

• (2) 1350 Series Precision Ground Bearing Caps (1.188" Diameter)

• (4) High-Tensile External Outside Snap Rings

• (1) Low-Profile Side-Cross Grease Zerk Fitting

Kit Highlights:

• Perfect Conversion Solution: Effortlessly connects a 1330 series driveshaft to a 1350 series pinion yoke, transmission slip yoke, or transfer case flange without modifying the yokes themselves.

• Fully Maintenance-Greaseable: Features an accessible grease zerk built right into the side of the cross body, making it easy to purge contaminants and prolong component life on heavily worked trucks or off-road rigs.

• Cold-Formed Journal Rigidity: Forged from high-grade alloy steel with a solid core architecture, maximizing torque capacity and resisting structural distortion under hard acceleration or heavy towing.

• Premium Multi-Lip Sealing: Outfitted with case-hardened thrust washers and robust multi-lip synthetic rubber boots that maintain a positive seal over wide angles of operation.

Drivetrain & Series Specifications:

• Yoke Retention Style: Outside Snap Ring (OSR) / External Lock-Up. Does not fit yokes designed for inside snap rings (ISR) or injected plastic retaining rings.

• Axis 1 (1330 Dimensions): 3.625 in Cap-to-Cap Width | 1.062 in Bearing Cap Diameter.

• Axis 2 (1350 Dimensions): 3.625 in Cap-to-Cap Width | 1.188 in Bearing Cap Diameter.

• Common Applications: Custom hot rod projects, classic muscle car transmission swaps, heavy-duty 4x4 axle conversions (such as swapping a Dana 60 or Ford 9-inch rear end into a half-ton truck), and custom lifted truck configurations.