ATP Parts B-449 Transmission Filter Kit

Transmission Filter Kit Overview

ATP Parts B-449 is a transmission filter kit for BMW applications that need clean fluid flow through the transmission. It is built to help keep debris from circulating through the valve body and other internal components, reducing the risk of clogging and wear.

Compatible With BMW M3, M4, M5, M6, M6 Gran Coupe, Z4, 135i, 135is, and 335is applications across the listed model years. This part number, B-449, is a direct fit service solution for BMW transmission maintenance.

• Transmission filter kit for routine service and fluid filtration.
• Helps keep transmission fluid cleaner as wear debris accumulates.
• Supports proper flow through the valve body and related internal parts.
• Fits BMW performance and luxury models across multiple model years.

Detailed Product Information

ATP Parts B-449 is intended for transmission service where maintaining clean fluid is critical to internal transmission operation. As debris builds up from normal use, the filter helps trap contaminants before they can restrict passages or interfere with valve body function. For BMW owners servicing a BMW M3, BMW M4, or BMW Z4, this filter kit provides a maintenance-focused replacement that supports transmission longevity. The B-449 part number is also useful when cross-referencing service needs for the same application.

Common Issues This Part Addresses

• Dirty transmission fluid from normal wear and tear.
• Restricted fluid flow caused by trapped debris.
• Clogging in the valve body or related internal passages.
• Increased wear from contaminated transmission fluid.
• Costly repairs linked to neglected transmission filtration.

Installation Notes and Tips

Use this filter during transmission service and follow the vehicle manufacturer’s service procedure for fluid replacement and inspection. Confirm the application by year, model, and notes before ordering, especially for BMW Z4 listings marked as sump filter. Verify the part number B-449 against the vehicle’s transmission service requirements.

Quality Assurance

ATP Parts designs transmission filters to keep transmission fluid clean and to help protect internal components from debris-related damage. This part cross-references BMW (e.g., 28 10 7 842 828) for the same application.