When the only thing standing between a clean fluid circuit and dirty flow is the Automatic Transmission Filter, having the right one for the specific unit matters. This listing covers a single Automatic Transmission Filter designed for the 3T40 automatic transmission, cataloged under model reference TH-125 and part number 125 125C, covering applications from 1980 onward with no defined end date. What sets this Automatic Transmission Filter apart from a kit listing is straightforward: it is one piece, one function, and nothing else is packed alongside it. No gaskets, no seals, no pan hardware. If your repair calls for only the Automatic Transmission Filter and you have already sourced the remaining components, this is the correct item to order. The 3T40 has been a long-running automatic transmission platform, and sourcing an Automatic Transmission Filter that is cataloged directly to that unit avoids the guesswork of cross-referencing a generic part. At approximately 1 lb, the Automatic Transmission Filter ships light but is verified against its part listing before it leaves the facility. REMCO has worked in automatic transmission parts since 1991, and each item that goes into a box here is checked against its catalog entry so what arrives matches what was ordered. Confirm that your unit is identified as a 3T40 or TH-125 and that part number 125 125C corresponds to the Automatic Transmission Filter configuration on your application before placing the order.