SKF 18870A Differential Pinion Seal - Rear

SKF Differential Pinion Seal for Jeep Rear Axles

The SKF 18870A differential pinion seal is built for rear axle sealing where lubricant retention and contamination control matter. It is a LongLife sealing surface design with precise dimensions for the pinion shaft and housing interface, making it a direct-fit service part for select Jeep applications.

Fits 2007-2017 Jeep Wrangler, rear and select 2007-2009 Jeep Commander, Grand Cherokee, and Liberty rear Spicer axle applications. The SKF 18870A is engineered to match the sealing surface requirements of the driveline, helping maintain proper differential fluid control in everyday driving and off-road use.

Key Features

• Part number: 18870A
• Differential pinion seal for rear axle service
• LongLife sealing surface type
• Outside diameter: 2.704 in.
• Width: 0.528 in.
• Shaft diameter: 1.890 in.
• Designed for select Jeep Wrangler, Commander, Grand Cherokee, and Liberty rear applications
• Cross-reference: Mopar 68003265AA

Detailed Description

SKF has a long history in seal engineering, and the 18870A reflects that focus with premium materials and application-specific design. The seal is sized for the pinion shaft and housing interface, with a 1.890-inch shaft diameter, 2.704-inch outside diameter, and 0.528-inch width to support a proper sealing fit in the differential assembly. For Jeep Wrangler rear axle service, as well as rear Spicer axle applications in the Jeep Commander, Grand Cherokee, and Liberty, this seal helps keep gear oil contained at the pinion area while limiting entry points for road debris and moisture.

Use SKF 18870A when replacing a worn or leaking rear differential pinion seal on compatible Jeep driveline setups. The part number 18870A is also a useful reference when matching service parts against OE-style listings, including Mopar 68003265AA.

What It Helps Address

• Rear differential gear oil seepage at the pinion area
• Fluid loss that can lead to low axle lubricant levels
• Contamination entering the differential through a worn seal
• Noise or wear concerns tied to improper axle lubrication
• Service replacement for aging Jeep rear axle seals

Installation Notes and Tips

Inspect the pinion yoke, shaft surface, and seal bore before installation. Any scoring, corrosion, or debris can affect sealing performance. Clean the housing thoroughly, verify the seal orientation before pressing it into place, and confirm the pinion area is properly lubricated during assembly. Always match the seal to the axle configuration listed for your vehicle.

Quality Assurance

SKF manufactures seals to specific application requirements using premium materials and controlled production standards. The brand’s seal engineering heritage and focus on long service life support dependable driveline sealing in demanding automotive environments.