TC Remanufacturing BM20 Automatic Transmission Torque Converter

Automatic Transmission Torque Converter BM20

TC Remanufacturing BM20 is an automatic transmission torque converter built as a lock-up unit with an 11.000-inch diameter and a medium stall profile. It uses a slotted hub, 4 mounting lugs, a 9.000 bolt circle, and a 1.040 pilot diameter for the specified application.

Key Features

• Part number: BM20
• Automatic transmission torque converter
• Lock-up converter type
• 11.000-inch converter diameter
• Medium stall characteristics
• Slotted hub design
• 4 mounting lugs
• 9.000 bolt circle
• 1.040 pilot diameter
• 27-spline count
• No ring gear
• Converter code: Ink Code P4

Detailed Description

This TC Remanufacturing torque converter is specified for automatic transmission service where the original unit calls for a lock-up design with a 27-spline connection and medium stall behavior. The BM20 configuration centers on the listed dimensions and mounting pattern, making it a direct-spec replacement for the matching transmission setup. If you are sourcing a BM20 torque converter for a BMW application, verify the transmission code and converter match before installation.

What It Helps Address

• Shudder or slip during torque converter lock-up
• Incorrect stall behavior from a worn converter
• Vibration related to hub, pilot, or mounting wear
• Transmission engagement issues tied to converter mismatch
• Loss of drivability caused by internal converter wear

Installation Notes and Tips

Confirm the 11.000-inch diameter, 9.000 bolt circle, 1.040 pilot diameter, 27-spline count, and 4-lug mounting pattern against the removed unit before installation. Check the transmission fluid condition, flush the cooler and lines as needed, and inspect the front pump, seals, and flexplate for wear. The ink code P4 should be matched to the required application during parts verification. For BMW torque converter replacement work, use the transmission identification and converter code together to confirm BM20 fitment.

Quality Assurance

TC Remanufacturing supplies remanufactured drivetrain components for transmission service, and this BM20 torque converter is built to the listed specifications for the intended application.