Transmission Filters

Transmission Filters: keep the fluid clean and the shifts consistent

A transmission filter sits in the fluid path and traps the clutch material, metal fines and casting debris that circulate through an automatic before they reach valve bodies, solenoids and clutch packs. When the filter clogs or bypasses, you get slow engagements, harsh or slipping shifts and rising fluid temperature. Fitting a fresh filter during a fluid service is the cheapest insurance a gearbox gets. Most of the transmission filters here are sold as service kits, so you get the element and the parts you need to seal it back up in one box.

What ThreePiece stocks

This category currently shows 5 products from 4 brands: BD Diesel, aFe, Radium Engineering and K&N Engineering. Prices run from $31 to $328 for what is in stock right now, which is a current range and not a fixed promise. The coverage skews toward diesel truck automatics and one performance application: the BD Diesel inline filter kit for the 1999-2003 Ford 4R100 sits at the top of the range, the BD Diesel service kit for the Dodge 68RFE covers late-model Cummins trucks, and the aFe ProGuard filter for 98-07 Dodge diesel trucks is a lower-cost option for the same crowd. For a different job entirely, the Radium Engineering stainless filter for the Nissan R35 GT-R and the K&N powersports transmission filter round out the range.

How to choose

Choice here is driven by your vehicle first, not by preference. The fitment data lists top makes of Dodge, Ford and Nissan, with vehicles including Dodge Diesel Trucks, the Ford 4R100, the Dodge 68RFE and the Nissan GT-R, across model years from 1998 to 2023. Match the filter to your transmission, not just your truck. Once you have the right application, the real trade-off is between a complete service kit and a bare filter: the BD Diesel kits include the service parts to reseal, while the aFe and Radium elements are the filter itself. A stainless element like the Radium is a reusable, cleanable choice; the paper-and-media filters are replace-at-service items. If price is the deciding factor, the aFe and K&N sit near the bottom of the range and the BD Diesel kits near the top.

What else you need with it

Filter service pairs with the rest of your driveline work. If you are in the transmission for a filter, look at clutch components and clutch rebuild kits while you have things apart, and at flywheels and shift components for the surrounding hardware. Rear-axle jobs pull in differential components. Browse the full Drivetrain section to see everything that fits alongside a filter service.

Fitment and ordering

Not sure which filter matches your transmission code? Call for fitment help at 813-535-5801 or reach us through contact us before you order. Every order ships free, and Affirm and Katapult financing is available at checkout.

Transmission Filters: keep the fluid clean and the shifts consistent

A transmission filter sits in the fluid path and traps the clutch material, metal fines and casting debris that circulate through an automatic before they reach valve bodies, solenoids and clutch packs. When the filter clogs or bypasses, you get slow engagements, harsh or slipping shifts and rising fluid temperature. Fitting a fresh filter during a fluid service is the cheapest insurance a gearbox gets. Most of the transmission filters here are sold as service kits, so you get the element and the parts you need to seal it back up in one box.

What ThreePiece stocks

This category currently shows 5 products from 4 brands: BD Diesel, aFe, Radium Engineering and K&N Engineering. Prices run from $31 to $328 for what is in stock right now, which is a current range and not a fixed promise. The coverage skews toward diesel truck automatics and one performance application: the BD Diesel inline filter kit for the 1999-2003 Ford 4R100 sits at the top of the range, the BD Diesel service kit for the Dodge 68RFE covers late-model Cummins trucks, and the aFe ProGuard filter for 98-07 Dodge diesel trucks is a lower-cost option for the same crowd. For a different job entirely, the Radium Engineering stainless filter for the Nissan R35 GT-R and the K&N powersports transmission filter round out the range.

How to choose

Choice here is driven by your vehicle first, not by preference. The fitment data lists top makes of Dodge, Ford and Nissan, with vehicles including Dodge Diesel Trucks, the Ford 4R100, the Dodge 68RFE and the Nissan GT-R, across model years from 1998 to 2023. Match the filter to your transmission, not just your truck. Once you have the right application, the real trade-off is between a complete service kit and a bare filter: the BD Diesel kits include the service parts to reseal, while the aFe and Radium elements are the filter itself. A stainless element like the Radium is a reusable, cleanable choice; the paper-and-media filters are replace-at-service items. If price is the deciding factor, the aFe and K&N sit near the bottom of the range and the BD Diesel kits near the top.

What else you need with it

Filter service pairs with the rest of your driveline work. If you are in the transmission for a filter, look at clutch components and clutch rebuild kits while you have things apart, and at flywheels and shift components for the surrounding hardware. Rear-axle jobs pull in differential components. Browse the full Drivetrain section to see everything that fits alongside a filter service.

Fitment and ordering

Not sure which filter matches your transmission code? Call for fitment help at 813-535-5801 or reach us through contact us before you order. Every order ships free, and Affirm and Katapult financing is available at checkout.