A-Premium Engine Rear Main Seal Cover Kit for OHV V8 4.8–7.0L – Direct-Fit, Integrated Sealing

A-Premium Engine Rear Main Seal Cover Kit replaces the rear main seal area for OHV V8 engines (4.8, 5.3, 5.7, 6.0, 6.2 and 7.0L) to restore reliable crankshaft sealing and simplify installation on many GM and related vehicles.

This rear main seal cover kit from A-Premium is built as a direct-fit replacement for a wide range of GM-family trucks, SUVs, vans and performance cars. It groups the cover, integrated sealing surfaces and mounting points into one assembly sized to the factory dimensions, which helps reduce installation time and ensures proper crankshaft alignment. The kit lists multiple OEM reference numbers for cross-checking and includes a one-year unlimited-mileage guarantee from A-Premium on workmanship.

Which vehicles will this rear main seal cover kit fit?

The kit supports many Chevrolet, GMC, Cadillac, Buick, Pontiac, Hummer and Isuzu platforms spanning late 1990s through 2020 model years. Fitment covers light trucks, full-size vans, SUVs and several performance models with OHV V8 engines. Always verify part reference numbers and engine displacement before purchase.

• Chevrolet: Avalanche, Camaro, Corvette, Silverado (1500/2500/3500 variations), Tahoe, Suburban, Impala and more
• GMC: Sierra, Canyon, Savana, Yukon series, Envoy and similar models
• Other: Cadillac Escalade/CTS, Hummer H2/H3, Pontiac GTO/G8, Saab 9-7X, Isuzu NPR series, Buick LaCrosse/Rainier
• Reference numbers: 635-518, 12633579, 12639250, 12615666, 12598301 and related SK/8-12### cross-refs

How does this kit help during an engine seal replacement?

The cover kit consolidates the rear main seal housing and related sealing surfaces into a pre-formed assembly that aligns to factory mounting points. That reduces the need for multiple separate parts and helps prevent common installation errors that cause leaks. Technicians and DIYers benefit from easier handling and fewer alignment adjustments.

• Pre-formed cover matches factory bolt pattern for correct alignment
• Integrated sealing surfaces minimize risk of oil seepage around the crankshaft
• Sized to original specifications: 2.7" inside diameter, 10" length, 6" width
• Includes cross-reference OEM numbers to confirm compatibility

What should I check before ordering to ensure fitment?

Confirm your engine displacement (4.8–7.0L OHV V8) and vehicle model-year range against the listed fitment. Match one of the reference part numbers or SK numbers to your vehicle’s parts documentation. If you plan to replace the main seal, inspect the crankshaft surface for wear and verify the pilot/bearing areas are within spec.

• Verify engine size and OHV configuration
• Cross-check reference numbers (e.g., 12633579, 12598301)
• Inspect crankshaft sealing surface for scoring before install
• Measure mounting face and bolt pattern against the existing cover

What does the kit include and what can I expect from A-Premium's support?

The kit is supplied as a complete rear main seal cover assembly sized to OEM dimensions with the appropriate sealing profile. A-Premium backs this part with a one-year unlimited-mileage workmanship guarantee, and their product documentation lists compatible models and reference numbers to aid in selection.

• Complete rear main seal cover assembly sized to factory specs
• Documented reference numbers for compatibility checks
• A-Premium one-year unlimited-mileage workmanship guarantee
• Designed for professional and experienced DIY installation

Who is this for? The A-Premium Engine Rear Main Seal Cover Kit is intended for mechanics, restoration shops and experienced DIYers servicing GM-family OHV V8 engines who need a direct-fit replacement cover. It's a practical choice when addressing rear crankshaft oil leaks on compatible Chevy, GMC, Cadillac and other listed vehicles, especially during engine overhauls or main seal replacements. Always confirm fitment with your vehicle's service manual and use proper installation tools and torque specs.