{"product_id":"bmw-e46-3-series-e85-z4-solid-billet-aluminium-rear-differential-bushing-set-1999-2008-excludes-e46-m3-z4m-replaces-33176770788-33176751808-33171093175-33171093565","title":"BMW E46 3 Series \u0026 E85 Z4 Solid Billet Aluminium Rear Differential Bushing Set 1999 - 2008 (Excludes E46 M3 \/ Z4M \/ Replaces 33176770788 \/ 33176751808 \/ 33171093175 \/ 33171093565)","description":"\u003cp\u003eEliminate 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.\u003c\/p\u003e\n\u003ch6\u003eFeatures:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eSturdy and durable construction – aircraft-grade 6061 billet aluminum material delivers exceptional strength, will never crack, deform, or fail like factory rubber bushings\u003c\/li\u003e\n\u003cli\u003eCNC machined precision – ensures high dimensional accuracy for proper fit to factory differential bracket geometry\u003c\/li\u003e\n\u003cli\u003eImproved road feel and alignment consistency – maintains differential position under all driving loads, eliminating the vague rear-end feedback caused by deformed factory rubber\u003c\/li\u003e\n\u003cli\u003eEnhanced driving experience – significantly improves throttle response and power transfer to the wheels by eliminating rubber compliance in the drivetrain\u003c\/li\u003e\n\u003cli\u003eAnodized surface finish – rust-proof and anti-corrosion protection for sustained underbody and weather exposure\u003c\/li\u003e\n\u003cli\u003eSolid metal construction – delivers maximum drivetrain stiffness for racing-grade performance applications\u003c\/li\u003e\n\u003cli\u003eDirect rubber bushing replacement – installs into factory differential bracket mounting positions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eSpecifications:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eCondition: 100% Brand New\u003c\/li\u003e\n\u003cli\u003eType: Solid Rear Differential Bushing Set\u003c\/li\u003e\n\u003cli\u003eMaterial: 6061 Aircraft-Grade Billet Aluminum\u003c\/li\u003e\n\u003cli\u003eConstruction: CNC Machined\u003c\/li\u003e\n\u003cli\u003eSurface Finish: Anodized\u003c\/li\u003e\n\u003cli\u003eNVH Increase: HIGH (will amplify road imperfections)\u003c\/li\u003e\n\u003cli\u003eRecommended Use: Racing \/ Track \/ Competition\u003c\/li\u003e\n\u003cli\u003ePosition: Rear Differential Mounting Bracket\u003c\/li\u003e\n\u003cli\u003ePurpose: Performance Upgrade \/ Solid Drivetrain Mount\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eOE \/ Replacement Part Numbers:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003e33176770788 \/ 33 17 6 770 788\u003c\/li\u003e\n\u003cli\u003e33176751808 \/ 33 17 6 751 808\u003c\/li\u003e\n\u003cli\u003e33171093175 \/ 33 17 1 093 175\u003c\/li\u003e\n\u003cli\u003e33171093565 \/ 33 17 1 093 565\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eFitment:\u003c\/h6\u003e\n\u003cp\u003e\u003cstrong\u003eWill NOT fit BMW E46 M3 or Z4M variants. Verify your model and trim before ordering.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBMW 3 Series E46 (1999 – 2005) – Excludes E46 M3\u003c\/li\u003e\n\u003cli\u003eBMW Z4 E85 (2003 – 2008) – Excludes Z4M\u003c\/li\u003e\n\u003cli\u003eCompatible with non-M variants only – not compatible with E46 M3 or Z4M which use different rear differential mounting geometry\u003c\/li\u003e\n\u003cli\u003eConfirm vehicle model, chassis code, and trim before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eContents:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eSolid Rear Differential Bushing Set\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eCritical Use-Case Warnings:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHIGH NVH increase:\u003c\/strong\u003e 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended for racing use:\u003c\/strong\u003e This product is designed for track day, autocross, drag racing, and competition applications where drivetrain stiffness and feedback take priority over comfort\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlip-fit installation:\u003c\/strong\u003e These bushings install with a slip fit. Epoxy may be required during installation due to variations in the stamped subframe holes – plan installation accordingly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDifferential version compatibility:\u003c\/strong\u003e 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\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eBenefits:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eEliminates the vague rear axle feedback caused by deformed factory rubber bushings – delivering uncompromised, direct rear-end response under all driving conditions\u003c\/li\u003e\n\u003cli\u003eCompletely suppresses differential displacement under load – the rear differential stays positioned with absolute precision during hard acceleration, deceleration, and gear changes\u003c\/li\u003e\n\u003cli\u003eSignificantly improves power transfer to the wheels – eliminates the rubber compliance that absorbs torque before it reaches the road\u003c\/li\u003e\n\u003cli\u003eMaximum 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\u003c\/li\u003e\n\u003cli\u003e6061 aircraft-grade billet aluminum construction provides permanent dimensional stability – will never wear out, crack, or degrade like rubber alternatives\u003c\/li\u003e\n\u003cli\u003eAnodized finish maintains the premium aluminum appearance and corrosion resistance for the lifetime of the vehicle\u003c\/li\u003e\n\u003cli\u003eEliminates wheel hop on hard launches – particularly valuable for drag racing and aggressive launch applications where rubber bushings allow uncontrolled differential movement\u003c\/li\u003e\n\u003cli\u003eOne-time permanent solution – install once and never deal with rubber bushing degradation again\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eNVH Disclosure:\u003c\/h6\u003e\n\u003cp\u003e\u003cstrong\u003eThis is a solid metal bushing set with NO vibration damping properties.\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003ch6\u003eInstallation Notes:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM-variant fitment exclusion:\u003c\/strong\u003e 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDifferential version identification:\u003c\/strong\u003e 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEpoxy may be required:\u003c\/strong\u003e 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShim sourcing:\u003c\/strong\u003e Source appropriate differential shims separately based on your differential version – this kit may not include shims, and shim quantity varies by application\u003c\/li\u003e\n\u003cli\u003eProperly 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\u003c\/li\u003e\n\u003cli\u003eMark the original orientation of all rear suspension and driveline components before disassembly\u003c\/li\u003e\n\u003cli\u003eCarefully press out the factory rubber bushings using proper bushing tools or a hydraulic press – do not damage the differential bracket during removal\u003c\/li\u003e\n\u003cli\u003eClean the bushing mounting bores thoroughly before installing the new aluminum bushings\u003c\/li\u003e\n\u003cli\u003eInstall the bushings with proper orientation per included instructions – use shims as needed to fill any gaps from differential version variations\u003c\/li\u003e\n\u003cli\u003eApply epoxy to the bushing mating surfaces if needed for secure installation\u003c\/li\u003e\n\u003cli\u003eTighten all rear differential mounting hardware to factory torque specifications using a calibrated torque wrench\u003c\/li\u003e\n\u003cli\u003eVehicle wheel alignment recommended after installation – differential bushing replacement can affect rear suspension geometry\u003c\/li\u003e\n\u003cli\u003eTest rear-end response and drivetrain behavior at low speeds before aggressive driving\u003c\/li\u003e\n\u003cli\u003eProfessional installation strongly recommended unless you have experience with rear differential and subframe service procedures\u003c\/li\u003e\n\u003cli\u003eIf 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\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eWarranty:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003e12-month standard warranty from date of purchase\u003c\/li\u003e\n\u003cli\u003eContact our support team for assistance with any issues\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"K2 Industries","offers":[{"title":"Default Title","offer_id":48610675982519,"sku":"1005011708764279","price":229.99,"currency_code":"USD","in_stock":true}],"url":"https:\/\/milkymotorsports.com\/products\/bmw-e46-3-series-e85-z4-solid-billet-aluminium-rear-differential-bushing-set-1999-2008-excludes-e46-m3-z4m-replaces-33176770788-33176751808-33171093175-33171093565","provider":"Milky Motorsports","version":"1.0","type":"link"}