Transmission Filters

Positioning

Transmission filters remove wear debris from transmission fluid to protect the valve body and clutches. They are OE-cross-referenced, and the key procurement risk is matching the exact transmission model — pan-mounted and external forms are not interchangeable.

What it is

A transmission filter removes wear debris from transmission fluid to protect the valve body and clutches.

Technical depth

Transmission filters are OE-cross-referenced. The catalogue publishes a range of part numbers including 35303-B1010, 35330-60070, 31728-3JX0C and 25420-PR0-030. Media type and micron rating are model-specific. The filter protects the valve body and clutches from the fine wear debris generated during normal shifts, which makes debris control the whole job. The critical variable is fitment: a pan-mounted filter sits inside the transmission sump, while an external filter mounts in a separate housing, and the two are never interchangeable. Because several of the catalogue references span Honda, Acura, Subaru and Isuzu applications, a single OE number can map to several different transmissions, so model-level confirmation is the gating step. Wear-debris generation is highest during break-in and heavy-shift duty, so the element is a protection item for the valve body and clutches rather than a routine consumable to be swapped by number alone.

Selection guidance

• Match by OE number; confirm the exact transmission model.
• Specify whether the filter is pan-mounted or external.
• Request media and micron-rating data where available.

Procurement notes

• Confirm the exact transmission model — pan-mounted and external filters are not interchangeable.
• Match by OE number first; the cross-reference is the discovery entry point.
• Request media and micron-rating data.

From a sourcing perspective

Our advice on transmission filters is that the mounting form is the single most important decision, ahead of media and micron rating. We recommend confirming whether the filter is pan-mounted or external and matching the exact transmission model, because a pan-mounted element and an external element are not interchangeable even within the same OE family. From a sourcing perspective, treat the OE number as a discovery point and let model-level confirmation lock the fitment; then request media and micron-rating data on the spec sheet. Given that the catalogue spans several makes, a wrong assumption about interchange is the most common and costliest error in this category. The mounting form, not the OE number, is what locks the fitment in this category. Treat the OE number as a discovery point and let model-level confirmation lock the fitment before requesting media data.