FAG SS2709 Differential Pinion Seal - Rear

FAG SS2709 Differential Pinion Seal Overview

The FAG SS2709 differential pinion seal is built for rear axle applications that need reliable sealing at the pinion area. It uses a metal case, spring, and auxiliary lip design with polyacrylate sealing material to help keep gear oil contained while blocking dirt, dust, and moisture.

Compatible with select Buick, Oldsmobile, and Pontiac rear axle applications, including classic Buick LeSabre, Buick Skylark, Oldsmobile Cutlass, Pontiac GTO, Pontiac LeMans, and Pontiac Tempest models.

Key Features

• Part number: SS2709
• Differential pinion seal for rear axle service
• Seal type: metal, spring, and auxiliary lip
• Sealing material: polyacrylate
• Bore diameter: 2.656 in. (67.462 mm)
• Outside diameter: 2.66 in. (67.564 mm)
• Seal width: 1.645 in. (41.783 mm)
• Designed to help retain lubricant and block contamination at the pinion seal location

Detailed Description

FAG SS2709 is a differential pinion seal engineered for rear axle sealing performance where dimensional accuracy matters. The metal case provides structural support, while the spring-loaded sealing lip and auxiliary lip help maintain contact at the shaft surface. With a polyacrylate sealing element and OE-style dimensions, this seal is suited to service work on vehicles that require a 1.645 inch shaft specification.

This part cross-references Timken 8620N and Davico Mfg 16500 for the same application. The SS2709 part number is also associated with global number 413 2709 100 in fitment notes.

Vehicle Fitment

• Fits 1965-1970 Buick LeSabre, rear
• Fits 1968-1970 Buick Skylark, rear, w/o Canadian Built 12 Bolt Cvr.; 1.645" Shaft
• Fits 1964-1967 Buick Skylark, rear
• Fits 1966-1967 Oldsmobile Cutlass, rear, Buick Axle
• Fits 1964-1965 Oldsmobile Cutlass, rear
• Fits 1964-1965 Pontiac GTO, rear
• Fits 1964-1965 Pontiac LeMans, rear
• Fits 1964-1965 Pontiac Tempest, rear

Common Problems This Seal Helps Address

• Rear differential oil leakage at the pinion area
• Contamination from road dirt, dust, and moisture
• Loss of gear lubricant from worn or damaged sealing surfaces
• Seal wear on classic Buick, Oldsmobile, and Pontiac rear axle assemblies

Installation Notes and Tips

Verify bore diameter, outside diameter, seal width, and shaft specification before installation. Inspect the pinion yoke and sealing surface for wear, scoring, or corrosion, since surface condition affects seal life. Clean the housing bore thoroughly and install the seal squarely to avoid distortion.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain the brand’s quality standards. The SS2709 is built for demanding wheel-end and driveline sealing requirements where correct fit and material selection are critical.