BMW E46 3 Series & E85 Z4 Solid Billet Aluminium Rear Differential Bushing Set 1999 - 2008 (Excludes E46 M3 / Z4M / Replaces 33176770788 / 33176751808 / 33171093175 / 33171093565)

Eliminate rear differential movement entirely on your BMW E46 or E85 Z4 with this premium solid billet aluminum rear differential bushing set, precision CNC-machined from aircraft-grade 6061 aluminum for permanent durability and uncompromising drivetrain response. Factory rubber differential bushings on the E46 and E85 Z4 are designed for daily-driver comfort with vibration absorption as the primary engineering goal — but this comfort-focused design wears rapidly under high-mileage or aggressive driving, resulting in vague rear-end feedback, wheel hop on hard launches, and unpredictable handling under load. This solid aluminum bushing set replaces the failure-prone rubber entirely with rigid metal construction that maintains perfect drivetrain alignment under all driving conditions, eliminating differential displacement and unlocking the maximum power transfer and handling precision the chassis is capable of. A racing-grade upgrade for serious track day, autocross, and competition builds where drivetrain feedback and consistency take priority over daily-driver comfort.

Features:

• Sturdy and durable construction – aircraft-grade 6061 billet aluminum material delivers exceptional strength, will never crack, deform, or fail like factory rubber bushings
• CNC machined precision – ensures high dimensional accuracy for proper fit to factory differential bracket geometry
• Improved road feel and alignment consistency – maintains differential position under all driving loads, eliminating the vague rear-end feedback caused by deformed factory rubber
• Enhanced driving experience – significantly improves throttle response and power transfer to the wheels by eliminating rubber compliance in the drivetrain
• Anodized surface finish – rust-proof and anti-corrosion protection for sustained underbody and weather exposure
• Solid metal construction – delivers maximum drivetrain stiffness for racing-grade performance applications
• Direct rubber bushing replacement – installs into factory differential bracket mounting positions

Specifications:

• Condition: 100% Brand New
• Type: Solid Rear Differential Bushing Set
• Material: 6061 Aircraft-Grade Billet Aluminum
• Construction: CNC Machined
• Surface Finish: Anodized
• NVH Increase: HIGH (will amplify road imperfections)
• Recommended Use: Racing / Track / Competition
• Position: Rear Differential Mounting Bracket
• Purpose: Performance Upgrade / Solid Drivetrain Mount

OE / Replacement Part Numbers:

• 33176770788 / 33 17 6 770 788
• 33176751808 / 33 17 6 751 808
• 33171093175 / 33 17 1 093 175
• 33171093565 / 33 17 1 093 565

Fitment:

Will NOT fit BMW E46 M3 or Z4M variants. Verify your model and trim before ordering.

• BMW 3 Series E46 (1999 – 2005) – Excludes E46 M3
• BMW Z4 E85 (2003 – 2008) – Excludes Z4M
• Compatible with non-M variants only – not compatible with E46 M3 or Z4M which use different rear differential mounting geometry
• Confirm vehicle model, chassis code, and trim before ordering

Contents:

• Solid Rear Differential Bushing Set

Critical Use-Case Warnings:

• HIGH NVH increase: Solid metal bushings will significantly amplify road imperfections, drivetrain noise, and vibrations into the cabin. This product is NOT recommended for daily-driven vehicles, comfort-focused street builds, or any application where cabin refinement is a priority
• Recommended for racing use: This product is designed for track day, autocross, drag racing, and competition applications where drivetrain stiffness and feedback take priority over comfort
• Slip-fit installation: These bushings install with a slip fit. Epoxy may be required during installation due to variations in the stamped subframe holes – plan installation accordingly
• Differential version compatibility: Due to the presence of multiple differential versions in the E46/Z4 (168, 188, and 210 case versions), a certain number of shims must be used to fill the gap when installing the bushings. Shim quantity varies based on your specific differential case version

Benefits:

• Eliminates the vague rear axle feedback caused by deformed factory rubber bushings – delivering uncompromised, direct rear-end response under all driving conditions
• Completely suppresses differential displacement under load – the rear differential stays positioned with absolute precision during hard acceleration, deceleration, and gear changes
• Significantly improves power transfer to the wheels – eliminates the rubber compliance that absorbs torque before it reaches the road
• Maximum drivetrain stiffness for racing applications – the solid metal construction delivers the most direct drivetrain feedback possible, critical for track day driving where consistent feel matters
• 6061 aircraft-grade billet aluminum construction provides permanent dimensional stability – will never wear out, crack, or degrade like rubber alternatives
• Anodized finish maintains the premium aluminum appearance and corrosion resistance for the lifetime of the vehicle
• Eliminates wheel hop on hard launches – particularly valuable for drag racing and aggressive launch applications where rubber bushings allow uncontrolled differential movement
• One-time permanent solution – install once and never deal with rubber bushing degradation again

NVH Disclosure:

This is a solid metal bushing set with NO vibration damping properties. Customers seeking a balance between performance and daily driveability should consider polyurethane bushings or aluminum insert kits (which fill voids in factory rubber bushings without replacing them) instead. Solid metal bushings deliver maximum performance benefit but at significant cost to cabin refinement and daily comfort.

Installation Notes:

• M-variant fitment exclusion: This set fits non-M E46 and E85 variants only. It will NOT fit E46 M3 or Z4M which use different rear differential mounting geometry. Verify your trim before ordering
• Differential version identification: Identify your differential version (168 small case / 188 medium case / 210 large case) before installation – this determines the number of shims required during installation. Check casting marks on the differential housing or consult vehicle service documentation
• Epoxy may be required: Due to variations in the stamped subframe mounting holes, epoxy adhesive may be required during installation to ensure proper bushing seating. Have automotive-grade epoxy on hand before beginning installation
• Shim sourcing: Source appropriate differential shims separately based on your differential version – this kit may not include shims, and shim quantity varies by application
• 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 orientation of all rear suspension and driveline components before disassembly
• Carefully press out the factory rubber bushings using proper bushing tools or a hydraulic press – do not damage the differential bracket during removal
• Clean the bushing mounting bores thoroughly before installing the new aluminum bushings
• Install the bushings with proper orientation per included instructions – use shims as needed to fill any gaps from differential version variations
• Apply epoxy to the bushing mating surfaces if needed for secure installation
• Tighten all rear differential mounting hardware to factory torque specifications using a calibrated torque wrench
• Vehicle wheel alignment recommended after installation – differential bushing replacement can affect rear suspension geometry
• Test rear-end response and drivetrain behavior at low speeds before aggressive driving
• Professional installation strongly recommended unless you have experience with rear differential and subframe service procedures
• If unsure about compatibility with your specific BMW variant, differential version, or installation requirements, contact our team with your year, model, chassis code, and differential version before ordering

Warranty:

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

Warranty Assurance:

At K2 Industries, your satisfaction is our priority, and we stand behind the quality of our products. Here's a brief overview of our warranty:

Defect Coverage:
If you find a defect after receiving your order, get in touch with us. We're committed to resolving the issue, whether it involves a replacement, repair, or refund.

Installation Note:
Please inspect your purchase before installation. Unfortunately, damages post-installation are not covered, so ensure everything looks good beforehand.

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Need to make a claim? Reach out to us at support@k2-industries.com. We're here to assist you. Just keep your original packaging and documentation handy.

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Your trust in K2 Industries is appreciated. We're dedicated to ensuring your satisfaction with our quality automotive parts.

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