Spicer U-Joint Kit 5-7166X 1350WJ (ISR) — 1.188" Bearing Cap, 2.406" Between Snap Rings

The Spicer 5-7166X U-Joint Kit (1350WJ Series, Inside Snap Ring style) is a direct-fit universal joint assembly designed to replace worn 1350-series U-joints with a 1.188" bearing cap diameter and 2.406" length between snap rings.

Spicer manufactures drivetrain components to match original equipment specifications so repairs restore fit and function. The 5-7166X kit uses the Inside Snap Ring (ISR) retention method and Spicer Life non-greaseable bearings to simplify installation and reduce routine maintenance demands. Whether you are rebuilding a driveshaft or refreshing a rear differential yoke, this part provides the dimensions and engineering commonly required for 1350-series applications.

How does this U-joint replace a worn 1350-series component?

The 5-7166X is sized to match 1350WJ-series geometry so it installs into yokes designed for inside snap ring retention. Because Spicer builds to OE tolerances, the bearing cap diameter and snap ring locations align with factory parts, limiting the need for modifications. Use the correct press and snap-ring tools to remove the old joint and press in the new one cleanly.

• Direct 1350-series fit: 1.188" bearing cap diameter.
• Length between snap rings: 2.406" to match yoke spacing.
• Inside snap ring style simplifies installation into yokes with internal grooves.
• Non-greaseable Spicer Life bearings reduce maintenance after installation.

What tools and steps are needed to install the Spicer 5-7166X?

Installation typically requires a vise or hydraulic press, snap-ring pliers, a drift sized for the bearing caps, and basic safety gear. Remove the old U-joint caps, clean the yoke bores, then carefully press the new caps squarely into position until snap rings seat in the internal grooves. Verify free rotation and correct snap-ring engagement before reassembling the driveshaft.

• Tools: press or vise, snap-ring pliers, cap drift, torque wrench.
• Prep: clean yoke bores and inspect for wear or cracks.
• Press-in: install caps squarely, then fit snap rings into internal grooves.
• Check: confirm smooth bearing rotation and secure snap-ring seating.

What are the main features and specifications of this kit?

The Spicer 5-7166X kit is built with Spicer Life non-greaseable bearings and ISR-style snap rings to meet common service needs. The critical dimensions—1.188" bearing cap diameter and 2.406" length between snap rings—define compatibility with 1350-series yokes. The kit replaces worn universal joints in applications that call for these exact measurements and the ISR retention method.

• Series: 1350WJ — matches 1350-series geometry.
• Retention: Inside Snap Ring (ISR) style for internal groove yokes.
• Bearing cap diameter: 1.188" (30.17 mm).
• Length between snap rings: 2.406" (61.12 mm).

Will this U-joint require regular greasing or special maintenance?

The Spicer 5-7166X uses non-greaseable Spicer Life bearings, which are sealed and do not require periodic greasing. That design reduces maintenance touchpoints but still benefits from routine visual inspections for wear, noise, or movement at the yoke. If the surrounding yoke or driveline shows damage, address that before installing the new joint.

• Sealed Spicer Life bearings eliminate routine greasing.
• Perform periodic visual inspections for play, noise, or leaks.
• Repair or replace damaged yokes or straps for reliable service life.

Who is this for: The Spicer 5-7166X U-Joint Kit is intended for mechanics, restoration specialists, and vehicle owners replacing 1350-series universal joints in cars, trucks, and off-road vehicles that use inside snap ring yokes. Choose this kit when you need an OE-dimension replacement with sealed, non-greaseable bearings and reliable fit for standard 1350WJ applications.