Moog K90444 Rack and Pinion Bellows Kit

Rack and Pinion Bellows Kit for BMW Steering

Restore protection around the steering rack with the MOOG K90444 rack and pinion bellows kit. This rubber bellows is built for BMW applications and includes the hardware and ties needed for a secure replacement. It is a direct-fit service part for maintaining the steering gear area on select BMW Z4, M3, 325, 328, and 330 models.

Key Features

• Rubber bellows construction for steering rack protection
• Includes hardware and ties
• Large end diameter: 1.975 in.
• Small end diameter: 1.615 in.
• Length: 7.500 in.
• 15-rib design
• No vent hole
• MOOG part number K90444

Product Details

The MOOG K90444 is a rack and pinion bellows kit designed for BMW steering systems. MOOG continually updates its chassis components to improve service life and make replacement easier, and this bellows follows that approach with a rubber body, formed ribbing, and included attachment pieces for a clean installation. It is a strong match for BMW Z4 steering service as well as BMW M3, 325Ci, 325i, 325xi, 330Ci, 330i, 330xi, 323Ci, 323i, 328Ci, 328i, and 323is applications. This part cross-references Delphi TBR4201 for the same application.

What It Helps Address

• Damaged or cracked steering rack bellows
• Contamination entering the rack and pinion area
• Loss of protection for steering components
• Wear from age, heat, and road exposure
• Replacement needs on BMW steering service jobs

Installation Notes and Tips

Inspect the steering rack, inner tie rod area, and clamps before installation. Clean the mating surfaces so the bellows seats properly, then secure it with the included hardware and ties. Verify the bellows length and end diameters match the vehicle before final assembly. Fits 2003-2008 BMW Z4, N/A; Fits 2001-2006 BMW M3, N/A; Fits 2001-2005 BMW 325Ci, N/A; Fits 2001-2005 BMW 325i, N/A; Fits 2001-2005 BMW 325xi, N/A; Fits 2001-2005 BMW 330Ci, N/A; Fits 2001-2005 BMW 330i, N/A; Fits 2001-2005 BMW 330xi, N/A; Fits 2000 BMW 323Ci, N/A; Fits 1999-2000 BMW 323i, N/A; Fits 2000 BMW 328Ci, N/A; Fits 1999-2000 BMW 328i, N/A; Fits 1999 BMW 323is, N/A.

Quality Assurance

MOOG is known in the chassis and steering market for ongoing design improvements that support easier replacement and longer part life. The K90444 is built as a service replacement for select BMW steering applications and is backed by MOOG’s engineering focus on problem-solving chassis components.