JBROPARTS BS40640 Rear Main Seal Kit for Chevy Silverado 1500 & GM LS Engines

Overview

The JBROPARTS BS40640 Rear Main Seal Kit is a comprehensive replacement solution designed for the GM LS engine family. It targets engines from 4.8L to 6.2L and is commonly used in popular trucks and SUVs such as Silverado 1500, Suburban, Tahoe, Sierra, and Yukon. This kit pairs a rear crankshaft seal with a precision metal gasket, creating a complete package that supports a proper seal at the rear of the engine.

Why choose the BS40640 kit

Rather than sourcing individual parts, this kit consolidates essential sealing components into one package. The included items follow OE/OEM references, aiding cross-reference when shopping for compatible replacements. The comprehensive content helps reduce guesswork during maintenance or routine engine service, and the metal gasket helps ensure a snug, long-lasting seal when installed with proper torque and alignment.

Broad vehicle coverage

Designed for a wide array of GM vehicles, the BS40640 kit matches engines used across Chevrolet and GMC lines. Coverage includes Silverado 1500, Silverado Classic, Suburban 1500, Tahoe, Sierra 1500, and Yukon families, as well as models such as Canyon, Envoy, Savana, Express, Colorado, Monte Carlo, Camaro, Corvette, and more. Because engine fitment varies by model year and engine option, always verify the specific part numbers for your build.

Engine family compatibility

• GM LS engines: 4.8L, 5.3L, 6.0L, 6.2L (and variants used in multiple GM trucks and SUVs).
• Relevant vehicle targets include pickup trucks, full-size SUVs, and vans across Chevrolet and GMC lines.

Contents and fitment notes

• Rear main crankshaft seal and metal gasket set designed to work with a broad spectrum of LS engine applications.
• Includes OE-style part numbers for traceability: BS40640, plus several cross-reference numbers listed in the product spec.

When you upgrade to this kit, you’re choosing a single, coherent solution that aligns with the engine’s sealing needs. It’s presented as a practical upgrade for anyone performing rear main seal replacement, with a focus on compatibility and quality. While results can vary with each installation and vehicle history, many users find that using a dedicated kit streamlines maintenance and supports reliable sealing over time.