Allison Transmission transmission filter for Freightliner MT45 (2020–2021) — OEM part 29539579, fits Allison 1000/2000/2400 series

Allison Transmission 29539579 is the genuine OEM transmission filter designed to protect and maintain fluid cleanliness in Allison-equipped Freightliner MT45 vans and compatible vehicles.

This genuine Allison Transmission filter (part number 29539579) is built to the manufacturer's specifications to help preserve transmission performance by trapping wear particles and contaminants. It’s intended for vehicles specified in the product listing — including the 2020–2021 Freightliner MT45 — and is also compatible with many vehicles that use Allison 1000, 2000 or 2400 series transmissions. Using an OEM filter helps ensure fitment, flow characteristics, and media quality match Allison’s service requirements.

Will this Allison filter fit my 2020–2021 Freightliner MT45?

If your MT45 is equipped with an Allison transmission as specified in the vehicle’s service documentation, this filter is the OEM replacement designed for direct fit. Confirm the part number in your maintenance manual or on the old filter to ensure exact match.

• Direct replacement for Allison part 29539579.
• Intended for Freightliner MT45 model years 2020–2021 when equipped with an Allison transmission.
• Check your vehicle’s VIN/service manual or existing filter label for final verification.

How does this genuine Allison filter protect the transmission?

The filter removes metallic particles, clutch debris and other contaminants from transmission fluid to maintain proper hydraulic function and reduce wear. Its media and construction are engineered to match Allison’s flow and filtration specifications so the transmission receives consistent, clean fluid.

• OEM media for targeted particle capture and reliable flow rate.
• Durable housing and sealing surfaces for leak-free operation.
• Helps preserve component life when used with scheduled fluid and filter changes.

Is this Allison filter compatible with other trucks and transmissions?

While packaged for the Freightliner MT45, the 29539579 filter is part of Allison’s line of service parts and fits many vehicles using Allison 1000, 2000 and 2400 series transmissions. It also covers a number of GM trucks from earlier model years that specify Allison filtration.

• Compatible with Allison 1000/2000/2400 series transmissions where listed.
• Known fitment range includes several GM trucks from the 2001–2018 model years that use Allison transmissions.
• Always cross-reference part numbers and vehicle service data for confirmation.

What should I expect when replacing the filter?

Replacement is straightforward when following the vehicle’s service manual: drain or access the fluid area as directed, remove the old filter, install the new Allison unit, and refill to specified fluid levels. Using genuine parts reduces the chance of fitment issues and helps maintain warranty and service compliance.

• Follow Allison and vehicle manufacturer service intervals for filter changes.
• Use the correct Allison-approved transmission fluid when refilling.
• Inspect seals and torque specifications to prevent leaks and ensure proper seating.

Who is this for: This genuine Allison Transmission 29539579 filter is for fleet managers, commercial vehicle technicians, and owner-operators who run Freightliner MT45 vans (2020–2021) or other vehicles equipped with Allison 1000/2000/2400 series transmissions and want a direct-fit, OEM-quality replacement. Choose this part when you need manufacturer-specified filtration, reliable fitment, and a simple, service-friendly swap during routine maintenance.