AUTOBABA Engine Rear Main Seal Cover Kit for GM 4.8–6.2L Trucks SUV — Aluminium, Gasket & Bolts

AUTOBABA Engine Rear Main Seal Cover Kit is a direct-fit aluminum replacement kit that includes gasket and fastening hardware to restore rear crankseal integrity on many GM V6 and V8 engines.

Designed as a drop-in replacement for worn or damaged rear main seal covers, this kit matches OEM dimensions and bolt patterns for a wide range of Chevrolet, GMC, Cadillac, Buick, Pontiac, Saab, Hummer and select Isuzu applications. Constructed from corrosion-resistant aluminum and supplied with a precision-cut gasket and bolts, the assembly helps stop oil leaks at the rear crankshaft opening while maintaining correct alignment with the engine block. Review fitment notes carefully—part numbers replaced include 635-518, 12633579 and 12639250—to ensure compatibility with your vehicle before ordering.

Will this cover stop an oil leak at the rear crankshaft?

When the original rear main seal cover is warped, cracked or corroded the seal can fail and allow engine oil to leak. Replacing the cover with a properly machined aluminum unit and a fresh gasket restores the sealing surface and prevents oil migration around the crankshaft area. Installation should include a new crankshaft rear seal if the seal itself is worn.

• Aluminum construction resists corrosion and warping
• Includes gasket and bolts for a complete installation
• OEM-style bolt pattern for correct alignment

How do I confirm this kit fits my truck or SUV?

Compatibility covers many GM models across multiple years and engines; verify by cross-referencing your vehicle’s year, make, model and engine displacement with the provided fitment list. Also check the original part number—this kit replaces 635-518, 12633579 and 12639250. If you have any doubt, compare the existing cover’s bolt holes and external shape before purchase.

• Fits Chevy, GMC, Cadillac, Buick, Pontiac, Saab, Hummer, Isuzu applications listed
• Replaces OEM part numbers 635-518 / 12633579 / 12639250
• Cross-check vehicle year and engine size (4.8, 5.3, 6.0, 6.2L) for accurate fit

What are the material and durability characteristics?

The cover is machined from high-grade aluminum to mirror factory tolerances and deliver long-term resistance to rust and heat cycling. The gasket included is manufactured for a tight seal against oil and typical engine contaminants; bolts are supplied to secure the assembly to the block without additional hardware sourcing.

• High-quality aluminum body for corrosion resistance
• Precision-cut gasket for improved sealing performance
• Complete bolt kit reduces installation delays

Can I install this myself or should a shop do it?

This cover kit is designed for direct replacement and can be installed by a competent DIY mechanic with the right tools and experience removing the transmission or accessing the rear of the engine. Because replacing the rear main area often involves transmission removal and careful torqueing of fasteners, many users prefer a professional installation to ensure seal orientation and flange flatness are correct.

• DIY possible with transmission support and torque wrench
• Professional installation recommended if you lack experience
• Follow manufacturer torque specs and use proper seal installation tools

Who is this for: This AUTOBABA Rear Main Seal Cover Kit is intended for owners and mechanics restoring oil-tight operation on GM V6 and V8 engines—particularly technicians working on Chevrolet Suburban, Silverado, Tahoe, Express, GMC Sierra/Yukon, Cadillac Escalade and similar platforms. It suits drivers dealing with oil leaks from a damaged rear cover or shops wanting an OEM-dimension replacement that includes gasket and bolts in one package. Always confirm fitment with your vehicle’s year, engine code and original part number before ordering.