ACDelco 12479020 Rear Axle Housing Cover Gasket - Differential Cover Gasket

The ACDelco 12479020 is a GM Genuine Parts rear axle housing cover gasket, also commonly referred to as a differential cover gasket. Engineered as a true OEM replacement, this rubber sealing gasket is designed to create a leak-resistant seal between the rear axle housing and its cover, helping to maintain differential fluid integrity and prevent costly fluid loss.

Key Features:

• OEM Quality: Designed, engineered, and tested to rigorous GM standards — the same part used in original production
• Material: Rubber construction for durable, reliable sealing performance
• Application: Compatible with GM 8.0 in., 8.50, and 8.625 ring gear axle assemblies without limited slip
• Color: Black
• Backed by GM: Covered under the GM Replacement Parts Limited Warranty
• Sold individually — also included with complete axle assembly and differential cover replacements

This gasket meets all applicable federal safety and quality standards. It is the correct OEM replacement for standard (non-limited-slip) rear axle applications using 8.50 and 8.625 ring gear differentials across a range of GM vehicles including Chevrolet, GMC, Buick, Isuzu, Oldsmobile, Saab, and others. OEM Part Number: 12479020.