BMW E81 / E82 / E87 / E88 1 Series, E90 / E91 / E92 / E93 3 Series & E84 X1 Billet Aluminum Rear Trailing Arm & Monoball Bearing Kit 2005 - 2015 (Replaces 33322406291 / 33326763477 / 33326763092)

Eliminate rear suspension flex and restore precise handling on your BMW E8X, E9X, or E84 X1 with this premium billet aluminum rear trailing arm and monoball bearing kit, precision crafted for permanent durability and dramatically improved suspension response. The BMW E9X rear suspension uses a complex five-link design where the trailing arm connects the subframe to the main axle through factory rubber bushings — these factory components are notoriously prone to deformation under aggressive driving (hard braking, hard acceleration, cornering loads), causing dramatic changes in rear suspension geometry that result in handling instability, deflection, and compromised sport performance. This complete kit addresses both the trailing arm itself (rigid billet aluminum construction) and the trailing arm bearing (custom monoball with dust seal) to deliver maximum suspension precision while maintaining street-friendly low NVH characteristics. The result is consistent rear suspension geometry under all driving conditions, sharper handling response, and the direct mechanical feel that performance BMW enthusiasts demand.

Features:

Rear Trailing Arm:

• Sturdy and durable construction – billet aluminum alloy delivers exceptional strength and durability compared to factory stamped components
• Enhanced rigidity – rigid design optimizes rear suspension geometry for better cornering stability and faster response
• Precision CNC engineering – advanced manufacturing ensures perfect fit to factory mounting points
• Direct OE replacement – no calibration required, installs directly into factory trailing arm position
• Improved driving experience – more responsive handling characteristics under all driving conditions

Trailing Arm Bearing:

• Custom-sized monoball bearing – matches factory dimensions for non-destructive replacement of factory rubber bushings using proper installation tools
• Dust cover seal design – keeps debris out and locks grease in for extended bearing life, avoiding the wear-prone conditions common to exposed spherical bearings
• Precision handling – stabilizes camber and toe geometry during cornering, acceleration, and braking for improved steering response
• Direct road feedback – monoball construction transfers spring and damper forces to the ground without rubber bushing lag
• Low NVH increase design – engineered for quiet daily driving with minimal impact on cabin comfort

Specifications:

• Condition: 100% Brand New
• Type: Rear Trailing Arm & Monoball Bearing Kit
• Trailing Arm Material: Billet Aluminum Alloy
• Bearing Material: 40Cr Bearing Steel
• Construction: CNC Machined
• Bearing Design: Sealed Monoball with Dust Cover
• NVH Increase: Low (designed for street use)
• Recommended Use: Street Performance / Spirited Driving
• Item Weight: 4 kg
• Position: Rear Trailing Arm Mount
• Purpose: Performance Upgrade / Suspension Geometry Stabilization

OE / Replacement Part Numbers:

• Trailing Arm: 33322406291 / 33 32 2 406 291
• Trailing Arm: 33326763477 / 33 32 6 763 477
• Trailing Arm Bearing: 33326763092 / 33 32 6 763 092

Fitment:

• BMW 1 Series:
• BMW E81 (2005 – 2013)
• BMW E82 (2007 – 2013) – Coupe
• BMW E87 (2005 – 2013)
• BMW E88 (2007 – 2013) – Convertible
• BMW 3 Series:
• BMW E90 (2005 – 2013) – Sedan
• BMW E91 (2005 – 2013) – Touring / Wagon
• BMW E92 (2005 – 2013) – Coupe
• BMW E93 (2005 – 2013) – Convertible
• BMW X1:
• BMW E84 X1 (2010 – 2015)
• Compatible with all engine variants and trim levels within the listed chassis range
• Confirm vehicle model, chassis code, and production year before ordering

Contents:

• Rear Trailing Arm Set (Pair)
• Rear Trailing Arm Monoball Bearing Set (Pair)

Benefits:

• Eliminates rear suspension geometry deflection caused by deformed factory rubber bushings – critical for consistent handling under aggressive driving
• Stabilizes camber and toe alignment during cornering, acceleration, and braking – maintaining proper rear tire contact patches under all loads
• Improves steering response and handling precision – the rigid trailing arm and monoball bearing combination delivers direct mechanical feedback
• Restores sport performance characteristics – addresses the common complaint of "vague rear-end feel" that develops as factory bushings age
• Billet aluminum trailing arm construction provides permanent dimensional stability – will not bend, crack, or fail under sustained loads
• Custom monoball bearing maintains factory dimensions – enables non-destructive bushing replacement with proper installation tools
• Dust cover seal design provides extended bearing life compared to exposed spherical alternatives – critical for daily-driven vehicles in varied weather conditions
• Low NVH increase design enables street use without harsh ride compromise – delivers performance benefits while maintaining daily driveability
• Comprehensive kit addresses both the trailing arm and bearing – avoiding the partial fix scenario where one wears out faster than the other
• Wide cross-platform compatibility makes this versatile for BMW enthusiasts who manage multiple E8X / E9X / E84 chassis

Important Use-Case Notes:

• Recommended for street and performance use: Designed for street, spirited driving, and weekend track day applications
• Low NVH increase: The monoball bearing design will provide slightly increased steering wheel feedback and road imperfection transfer compared to factory rubber bushings, but is engineered for daily-driver compatibility
• Wheel alignment recommended: Have your vehicle professionally aligned after installation to verify proper rear suspension geometry
• Specialized installation tools: Bearing replacement requires proper bushing extraction/installation tools or hydraulic press for non-destructive installation

Installation Notes:

• Specialized tools required: Trailing arm bearing replacement requires a hydraulic press or proper bushing installation tools – do not attempt installation without correct equipment
• Properly support the rear of the vehicle on jack stands rated for the vehicle weight before beginning installation – never work under a vehicle supported only by a jack
• Mark the original alignment positions of all rear suspension components before disassembly
• Carefully remove the factory rear trailing arms from the vehicle following factory service procedure
• Use proper bushing installation tools to non-destructively replace the factory rubber bushings with the new monoball bearings – the custom-sized monoball matches factory dimensions for clean installation
• Inspect surrounding rear suspension components during installation – worn control arms, sway bar links, or other rear suspension components will compromise the performance benefits of the upgraded trailing arms
• Apply manufacturer-specified grease to the monoball bearing during installation – do not run dry, as this accelerates wear
• Install the new billet aluminum trailing arms in the factory mounting positions
• Tighten all rear suspension hardware to factory torque specifications using a calibrated torque wrench
• Have the vehicle professionally aligned after installation – trailing arm replacement directly affects rear suspension geometry
• Bed in the new components with progressively increased driving loads over the first 100-200 miles before aggressive driving
• Test rear-end behavior at low speeds before aggressive driving
• Professional installation strongly recommended – rear suspension work requires geometry knowledge and proper torque specifications
• If unsure about compatibility with your specific BMW variant, contact our team with your year, model, and chassis code before ordering

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues