MOOG Greaseable Super Strength U-joint 377 for Jeep Wrangler — Heavy-Duty with MicroShield corrosion protection

MOOG 377 Greaseable Super Strength Universal Joint is a heavy-duty, serviceable driveshaft U-joint engineered to restore reliable drivetrain movement and extend service life.

This greasable MOOG Super Strength® universal joint is built from hardened steel components, precision ground bearing cups and nitrile seals to resist contamination. Designed for demanding torque loads, the unit includes MOOG’s MICRO SHIELD™ corrosion protection and a radial bearing cup design that distributes lubricant 360 degrees for improved wear resistance. The part aims to simplify installation and maintenance while offering broad vehicle coverage across domestic and select foreign nameplates.

Will this MOOG U-joint fit my Jeep Wrangler and other trucks?

Compatibility depends on year, model and driveshaft specifications; always confirm fitment before purchasing. Use vehicle year, make, model, engine and trim to check compatibility, and review any additional fit notes provided by the seller.

• Check the Amazon Confirmed Fit tool with all vehicle details.
• Refer to MOOG part number 377 dimensions against your old U-joint.
• Contact seller or mechanic if fit notes show special qualifiers.

How does the greasable design improve service life?

The greasable construction allows periodic lubrication to reach all bearing surfaces, reducing friction and limiting wear. MOOG’s radial bearing cup layout promotes 360-degree grease distribution so maintenance effectively refreshes lubrication throughout the joint.

• Grease fitting lets you replenish lubricant without disassembly.
• Radial cup design disperses grease evenly to reduce hot spots.
• Nitrile seals retain grease and keep dirt and water out.

What makes this universal joint stronger than standard replacements?

MOOG builds the unit with cold-forged, case-hardened bearing cups and a forged, carburized steel cross for increased fatigue strength. Additional protective coatings and precision grinding ensure consistent fit and long-term durability under heavier torque loads.

• Cold-forged, case-hardened bearing cups for wear resistance.
• Forged and carburized steel cross for higher load capacity.
• Precision grinding for accurate tolerances and smoother operation.

What corrosion protection and sealing features are included?

MOOG’s MICRO SHIELD™ coating reduces surface oxidation, helping the joint resist rust in wet or salty conditions. Nitrile lip seals retain grease and act as a barrier against road grime, helping maintain optimal lubrication between service intervals.

• Micro Shield coating to slow corrosion on external metal surfaces.
• Nitrile seals for effective grease retention and debris exclusion.
• Sealed bearing cups minimize contaminant ingress during use.

Who is this for: The MOOG 377 greasable Super Strength universal joint is aimed at DIY mechanics, off-road enthusiasts and professional technicians who need a serviceable, heavy-duty U-joint for Jeep Wrangler driveshaft repair or upgrades on compatible Dodge, Fargo and other trucks. Choose this part if you want easier maintenance access, enhanced corrosion resistance and a design built for higher torque and extended durability.