TC Remanufacturing BM44 Automatic Transmission Torque Converter

BMW Automatic Transmission Torque Converter

The TC Remanufacturing BM44 is an automatic transmission torque converter built for select BMW applications with a lock-up design and OE-style fitment details. It is specified with a 10.875-inch converter diameter, 9.250-inch bolt circle, and a slotted/stepped hub for the listed BMW 325Ci, 325i, 525i, Z4, 323Ci, and 323i applications.

Key Features

• Part number BM44 for direct reference during ordering and service lookup
• Lock-up torque converter design for the listed BMW automatic transmissions
• 10.875-inch converter diameter with 9.250-inch bolt circle
• 27-spline count and slotted/stepped hub type
• 3-pad mounting pattern with 10mm x 1.5 mounting points
• Pilot diameter of 1.257 inches and pilot length of 1.600 inches
• Slight low stall calibration
• Blue visible markers for identification
• Converter codes: 156-208, A14 (some), C51, J28, N33, S38

Detailed Description

TC Remanufacturing BM44 is an automatic transmission torque converter for BMW rear-wheel-drive applications that require the listed lock-up configuration and dimensional match. It is built around the specified hub, spline, pilot, and mounting dimensions to align with the transmission and flexplate interface used in 2000-2006 BMW 323Ci, 323i, 325Ci, 325i, 525i, and Z4 models. The BM44 part number is useful when matching the converter to service records, transmission codes, or replacement planning for BMW 325Ci and BMW Z4 automatic transmission repairs.

This part cross-references 156-208 and C51 for the same application.

What It Is Used For

• Replacing a worn or failing BMW automatic transmission torque converter
• Addressing shudder or slip concerns related to lock-up operation
• Restoring proper engagement between the engine and transmission
• Correcting vibration or drivability issues tied to converter wear
• Supporting transmission service on BMW 325Ci, 325i, 525i, Z4, 323Ci, and 323i vehicles

Installation Notes and Tips

Verify the converter codes, spline count, bolt circle, pilot dimensions, and mounting style before installation. Confirm transmission compatibility against the vehicle’s build data and compare the original unit’s visible markers and hub style to the BM44 specifications. Proper fluid fill, converter seating, and transmission inspection are important before returning the vehicle to service.

Quality Assurance

TC Remanufacturing supplies remanufactured drivetrain components with application-specific dimensional control for service replacement. The BM44 is identified by its listed converter codes and physical specifications to support accurate matching for BMW automatic transmission service.