atp automotive Transmission Filter Kit for GM 6L80 Heavy-Duty 6-Speed — Direct-Fit Filter with Reusable Pan Gasket

ATP Automotive B-239 is a direct-fit automatic transmission filter kit engineered to match OE filtration and fluid flow for GM 6L80 heavy-duty 6-speed transmissions.

This filter kit replaces the original filter element and includes a reusable-style gasket to restore proper sealing and maintain consistent transmission fluid cleanliness. The B-239 is built to ATP Automotive standards to help remove wear-related particles, preserve valve-body channels, and sustain hydraulic performance. Use this kit as part of routine service to reduce the likelihood of clutch slipping or hydraulic restriction caused by clogged filter media.

How does the B-239 filter protect my GM 6L80 transmission?

The B-239 uses media and flow characteristics specified to meet the original equipment manufacturer’s targets, capturing debris while allowing the correct fluid volume to reach valve bodies and servos. Cleaner fluid keeps metering circuits working and minimizes abrasive wear on internal components.

• OE-level particle filtration matched to factory specification
• Maintains designed fluid flow rates for stable hydraulic pressure
• Reduces contamination-driven valve body clogs and wear
• Included gasket restores a leak-resistant pan seal

What is included in the kit and how does it prevent leaks?

The B-239 kit contains a replacement filter element and a reusable-style pan gasket sized for GM 6L80 pans. The gasket replaces aged or compressed seals that commonly cause seepage, while the correct filter height and fitment prevent misalignment that can create bypass or leakage paths.

• Replacement filter element sized for proper sump immersion
• Reusable-style gasket to replace old, brittle seals
• Fit designed to reduce common pan leak points
• Compatibility with GM 6L80 heavy-duty 6-speed transmissions (confirm fit by vehicle)

When should I install the B-239 during maintenance?

Install this filter kit at recommended transmission service intervals or whenever you perform a pan drop and fluid change. Replacing the filter during routine service helps maintain consistent lubrication and hydraulic function, and it’s a cost-effective preventative step against more extensive internal damage.

• Replace at manufacturer-recommended transmission service intervals
• Install during any pan removal or fluid change service
• Consider replacement if you notice fluid contamination or shifting issues
• Easy preventive maintenance to extend transmission life

How do I confirm fitment for my vehicle?

Confirming fitment requires checking your vehicle’s year, make, and model against the GM 6L80 application list or consulting a parts lookup tool. The B-239 is intended for GM 6L80 heavy-duty 6-speed transmissions, but variations in pans and cross-member clearance make verification important before ordering.

• Verify year/make/model with parts lookup or dealer cross-reference
• Confirm transmission code 6L80 on vehicle documentation or service sticker
• Check pan shape and bolt pattern visually if unsure
• Contact ATP Automotive resources for additional fitment guidance

Who is this for? The ATP Automotive B-239 filter kit is aimed at technicians, DIY mechanics, and fleet managers who service GM vehicles equipped with the 6L80 heavy-duty 6-speed transmission and want OE-level filtration and a reliable gasket replacement. It’s a practical choice for anyone maintaining shift quality and hydraulic function through routine fluid and filter service, and for those who want an OEM-spec alternative when rebuilding or refreshing the transmission at scheduled intervals.