Doc's Diesel 6.6L Duramax Transmission Filter Kit — Allison 2001–2019, direct-fit with install gasket & high-flow media

Doc's Diesel 6.6L Duramax Transmission Filter Kit is a direct-fit Allison transmission filter replacement for 2001–2019 Chevy/GMC 2500HD and 3500HD trucks, supplied with its install gasket for an immediate OEM-equivalent swap.

If you maintain a 6.6L Duramax paired with the Allison 1000 series transmission, this transmission filter kit replaces worn filtration parts that protect torque converters, pumps, and valve bodies from abrasive particles and fluid breakdown. Designed to meet or exceed the original equipment's dimensions and performance standards, the kit fits the same mounting points and requires no adapters or trimming. It is compatible with the Allison replacement numbers and popular aftermarket cross-references so you can match service intervals confidently.

How does this filter kit fit my 6.6L Duramax Allison transmission?

The kit is engineered as a direct replacement for the Allison 1000 transmission used behind 6.6L Duramax engines in Chevrolet and GMC 2500HD/3500HD trucks from 2001 through 2019. It matches the OEM form, fit, and function so installation follows factory procedures and torque specs.

• Direct OEM cross-references: replaces Allison 29539579, Wix 57701, Premium Guard PT1276.
• Includes the install gasket so no separate seal purchase is required.
• Fits model years 2001–2019; 2020 and later use a different filter design.

What protection and performance can I expect from this filter?

The kit uses high-flow filtration media that traps particulates without overly restricting fluid flow, protecting internal transmission components under normal and heavy-duty use. It’s tested for filtration efficiency, dirt-holding capacity, and burst strength to provide dependable service life when changed on schedule.

• High-flow media preserves hydraulic performance while capturing wear particles.
• Tested for burst strength and dirt capacity for durability under load.
• Helps reduce abrasive wear on torque converter and fluid pump components.

When should I change the Allison transmission filter?

Service intervals vary with driving conditions: change the filter every Allison fluid service to maintain protection. Typical guidance suggests replacement around 25,000 to 50,000 miles under normal conditions, with a conservative maximum interval near 60,000 miles; shorten intervals if you tow, haul heavy loads, or operate in severe environments.

• Normal use: aim for 25,000–50,000 miles per service interval.
• Heavy towing/hauling: change more frequently than standard intervals.
• Always replace the filter when performing a full Allison fluid change.

Will this drop in without modifications?

Yes — the Doc's Diesel kit is built to OEM dimensions so it installs using the factory mounting and sealing points. You should be able to reuse factory hose connections and follow standard Allison transmission service procedures.

• No adapters or trimming required: designed for direct replacement fit.
• Comes with the install gasket pre-included to simplify the job.
• Meets or exceeds OEM fit, form, and function for reliable service life.

Who this is for: This transmission filter kit is intended for owners, technicians, and fleet managers of Chevrolet and GMC 2500HD/3500HD trucks with the 6.6L Duramax and Allison 1000 transmissions built between 2001 and 2019. Choose this kit if you want an OEM-equivalent, ready-to-install filter and gasket that supports routine Allison fluid maintenance and helps protect transmission internals under everyday driving and heavy-duty use.