TC Remanufacturing B25SZHS Automatic Transmission Torque Converter

BMW Automatic Transmission Torque Converter

TC Remanufacturing B25SZHS is an automatic transmission torque converter built for select BMW applications with a lock-up design, medium stall characteristics, and OE-style mounting dimensions. It is a direct-fit replacement for many BMW 3 Series and 5 Series models, including BMW 325Ci, 528i, Z3, 318ti, 323i, 328i, 328is, 318i, 318is, 325i, 325is, 525i, and 525iT applications.

Key Features

• Part number: B25SZHS
• Automatic transmission torque converter
• Lock-up converter type for controlled drivability
• 11.000-inch converter diameter
• 9.750 bolt circle
• 3-pad mounting type
• 0.825 pilot diameter
• 27-spline count
• Slotted hub type
• Medium stall calibration
• No ring gear

Detailed Description

This TC Remanufacturing torque converter is specified for BMW automatic transmissions that require an 11.000-inch, 27-spline, lock-up converter with a slotted hub and 3-pad mounting pattern. The B25SZHS part number is a fitment-based replacement for BMW 325Ci models from 2003-2005, BMW 528i models from 1997-2000, BMW Z3 models from 1996-2000, and additional BMW 3 Series and 5 Series applications listed below. Its medium stall setup supports smooth engagement characteristics for street-driven vehicles while maintaining the lock-up function used in many OE transmission calibrations.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Shudder or slip related to a worn torque converter clutch
• Delayed or inconsistent engagement from a failing converter
• Excessive vibration caused by internal converter wear
• Poor drivability from incorrect stall behavior
• Transmission performance issues tied to damaged hub or spline interfaces

Installation Notes and Tips

• Verify converter diameter, spline count, pilot diameter, and bolt circle before installation.
• Confirm the transmission uses a 3-pad, lock-up converter with a slotted hub.
• Inspect the transmission fluid, cooler, and flexplate condition before replacing the converter.
• Flush the cooler and lines if contamination is present to help protect the replacement unit.
• Match the application exactly to the vehicle year, model, and transmission configuration.

Quality Assurance

TC Remanufacturing supplies transmission hard parts and remanufactured drivetrain components for service replacement applications. B25SZHS is built to match the listed BMW fitment and dimensional specifications for proper transmission integration.

• Fits 2003-2005 BMW 325Ci, N/A
• Fits 1997-2000 BMW 528i, N/A
• Fits 1996-2000 BMW Z3, N/A
• Fits 1996-1999 BMW 318ti, N/A
• Fits 1998-1999 BMW 323i, N/A
• Fits 1996-1999 BMW 328i, N/A
• Fits 1996-1999 BMW 328is, N/A
• Fits 1991-1998 BMW 318i, N/A
• Fits 1997 BMW 318is, N/A
• Fits 1994-1995 BMW 325i, N/A
• Fits 1992-1995 BMW 325is, N/A
• Fits 1991-1995 BMW 525i, N/A
• Fits 1993 BMW 525iT, N/A