US E46 Rear Axle Carriers: RWD Non-M and M3 Donor Identification

Verified non-M chain: 33311094410 -> 33316757435 -> 33316770865; RealOEM identifies 33316757435 as retrospectively exchangeable and the dealer record lists both earlier numbers as replaced. Verified M3 chain: 33312229290 -> 33312282490; BMWFans reports retrospective exchangeability. No supersession or interchange is asserted between the non-M and M3 families, and no later number is appended without a recipient-VIN EPC check.

Begin with both VINs/build dates, US body and drivetrain, readable factory identity and actual-piece photographs. This guide publishes two separate carrier families: the checked RWD non-M branch and the US E46 M3 branch. Do not use E46 naming, shared body attachment locations or shared loose hardware to infer interchange. Verify differential case and mount, trailing/control-arm pickup points, sway-bar brackets, braces or V-strut interfaces, bushing positions, ABS and parking-brake routing, heat shields and every threaded hole. A bare carrier does not include differential, rear cover, axles, trailing arms, control arms, hubs/bearings, brakes, springs, shocks, sway bar/links, braces, bushings, sensors, wiring, cables, shields or fasteners unless each item is listed. Require straight datum and pickup points; reject cracks, buckling, bent ears, elongated or torn holes, severe pitting or perforation, collision marks, heat, filler, grinding, non-factory welds, straightening or coating that hides condition. The removable carrier and the welded body rear-axle-carrier support are different structures. BMW service material documents cracks in the body structure around carrier mounting points; replacing the removable carrier does not repair a cracked, torn or displaced floor/support. Have the recipient body and donor carrier inspected and measured by a qualified structural or alignment professional when damage is suspected. Use appropriate lifting equipment, current BMW procedures and hardware rules, and complete a professional four-wheel alignment after installation.

A correctly identified straight factory carrier is the accepted identity path. Weld-in body reinforcement plates, carrier reinforcements, repaired or powder-coated carriers, solid or polyurethane bushings and modified geometry or differential-mount conversions are separate structural or performance decisions with installation, noise/vibration/harshness and alignment consequences. None is represented as an OE-equivalent carrier identity, and reinforcement or coating must not conceal cracks, corrosion, heat, collision damage or prior repairs.

US/LHD E46 only, narrowed to proven RWD non-M and 2001-2006 M3 branches. Match both VINs/builds and exact carrier identity; non-M 33311094410 -> 33316757435 -> 33316770865 and M3 33312229290 -> 33312282490 are separate families. xi/AWD, E36, Z3/Z4, non-US/RHD and modified carriers are excluded. Require itemized contents and actual-piece photos. Reject cracks, deformation, torn mounts, serious corrosion, heat, welds, filler or straightening. Inspect the recipient body support separately because a removable carrier does not repair cracked or displaced floor mounts. Use qualified structural inspection, proper lifting, current BMW procedures and final alignment.

Supersede reviewed 14 unique research sources for this guide. 6 also appear above as a seller or official action and are not repeated here; 8 additional citations follow.

Research last verified 2026-07-30.

1. RealOEM — partxrefOpen source
2. RealOEM — showpartsOpen source
3. RealOEM — partxrefOpen source
4. Bmwtechinfo bmwgroup — ST041 E46 M Complete VehicleOpen source
5. Bmwtechinfo bmwgroup — B410408FR Description 0054198Open source
6. Bmwrepairguide — 410109Open source
7. Bmwrepairguide — 410408Open source
8. Bmwfans — 33312282490Open source