Description
Product Overview
The UnayKolb Rear Main Seal Kit is designed specifically for Chevrolet engines with displacements of 4.8, 5.3, 6.0, and 6.2 liters. Featuring the OEM part numbers 635-518 and 13932863, this kit includes a high‑grade gasket that delivers superior sealing performance. Constructed from premium, oil‑resistant compounds, the gasket resists deformation and wear, ensuring a long‑lasting seal that minimizes the risk of oil leaks. The kit is packaged to meet the exact dimensions of the original equipment, guaranteeing a perfect fit without the need for modifications.
Usage
Ideal for both professional workshops and home garages, this seal kit is suited for routine maintenance, engine rebuilds, or replacement after a leak diagnosis. It fits a wide range of Chevrolet models, making it a versatile solution for owners of trucks, SUVs, and performance cars. Installation requires standard tools and can be completed within a typical service interval, reducing downtime and labor costs. 
Why Choose Us
UnayKolb stands out for its commitment to material quality and precision engineering. Each gasket is produced using high‑end equipment that eliminates common defects such as porosity or uneven thickness. Our rigorous quality control process ensures every kit meets OEM specifications, providing confidence in fit and function. Additionally, the product is backed by a one‑year warranty, reflecting our confidence in durability and performance, and offering customers added peace of mind.
Key Features
- Exact OEM fit for Chevrolet 4.8‑6.2L engines, eliminating guesswork.
- Premium oil‑resistant material delivers reliable, leak‑free performance.
- Enhanced sealing design reduces the chance of future leaks and extends service life.
- One‑year warranty provides assurance of quality and durability.
- Easy installation with standard tools, suitable for both DIY and professional mechanics.
FAQ
Does this kit include all necessary components?
Yes, the kit contains the gasket and all required hardware to replace the rear main seal on the specified Chevrolet models.
Can I install this seal myself?
Absolutely. The kit is designed for straightforward installation using common hand tools. Detailed instructions are included to guide you through the process.
What warranty does UnayKolb provide?
The product comes with a one‑year limited warranty covering defects in material and workmanship.
Is this seal compatible with engines that have been modified?
The seal is engineered to match OEM specifications. If your engine has significant modifications that alter the seal housing dimensions, we recommend consulting a professional before installation.
How does this gasket compare to cheaper alternatives?
UnayKolb uses higher‑grade materials and stricter manufacturing tolerances, resulting in better sealing performance and longer service intervals compared to low‑cost, generic gaskets.





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