Spicer U-Joint Kit 5-3212X (1555WJ Series ISR) 1.375" Cap, 3.737" Span — Pre-filled, Triple-Lip Seal

The Spicer 5-3212X U-Joint Kit (1555WJ Series, ISR) is a premium, non-greaseable universal joint engineered for long life, high strength, and reliable sealing in demanding driveline applications.

Built to the Spicer Life standard, this universal joint kit combines cold-formed journal crosses, precision bearing caps, and a robust triple-lip seal with an external seal guard to resist contamination. Each trunnion includes generous grease reservoirs and is factory-filled with synthetic lithium grease to reduce friction and withstand elevated operating temperatures. Designed for inside snap ring (ISR) installations, the 1555WJ Series fits applications that require a 1.375" bearing cap diameter and a 3.737" length between snap rings.

What makes the 5-3212X stronger than standard U-joints?

This Spicer Life series joint uses cold-formed steel journal crosses for improved tensile strength and fatigue resistance. Manufacturing precision and material selection target extended service life under heavy loads.

• Cold-formed high-grade steel crosses for enhanced durability
• Precision-machined bearing caps to reduce play and wear
• Factory-filled synthetic lithium grease for lower friction and heat tolerance

How does the sealing system protect the joint in harsh conditions?

The joint employs a triple-lip seal combined with an external seal guard to keep contaminants out and lubricant in. This layered sealing approach reduces ingress of dirt, water, and debris—helpful in off-road, industrial, or high-mileage settings.

• Triple-lip internal seal for multiple sealing barriers
• External seal guard for added protection against impacts and contamination
• Non-greaseable design prevents over- or improper greasing in sealed installations

Which dimensions and installation style should I check before buying?

Confirm the bearing cap diameter and the length between snap rings to ensure fitment. The Spicer 5-3212X is configured for inside snap ring (ISR) installation and matches many driveshaft and driveline assemblies that call for 1555WJ Series dimensions.

• Bearing cap diameter: 1.375 inches (measure bore size)
• Length between snap rings: 3.737 inches (verify shaft spacing)
• Inside Snap Ring (ISR) style—fits housings designed for internal snap rings

Why choose a pre-filled, non-greaseable Spicer Life joint?

A pre-filled, non-greaseable unit reduces maintenance points and the risk of incorrect lubrication while offering high-temperature grease designed for longevity. It’s a practical option where sealing reliability and consistent lubrication are priorities.

• Pre-filled synthetic lithium grease for consistent factory lubrication
• Non-greaseable construction minimizes maintenance needs and contamination risk
• Snap ring retention simplifies installation in compatible housings

Who is this for: The Spicer 5-3212X U-Joint Kit is aimed at professionals, mechanics, fleet managers, and knowledgeable DIYers who need a robust, sealed universal joint for heavy-duty driveshafts or other driveline components. It suits applications requiring ISR installation, reliable contamination resistance, and a factory-filled lubricant for reduced upkeep.