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    Home / BMW LSD and gear ratio swap tools / BMW Differential crown ring spacer for low to high gear ratio swap
    RacingDiffs BMW Differential Crown Ring Spacer for optimal gear alignment

    BMW Differential crown ring spacer for low to high gear ratio swap

    RD3010

    159,00€ - 172,00€
    Size

    BMW LSD Carrier Swap Spacer — Low → High Gear Ratio Conversion (3.15–4.45)

    Unlock the full potential of your BMW differential with the RacingDiffs LSD Carrier Swap Spacer. Purpose-built to let you install a high gear ratio LSD carrier (typically 3.15–4.45, common on E30/E36/E34 tds) into a housing originally matched to a low gear ratio carrier (2.64–3.07)—no machining required.

    Key Features
    • Precision engineering: CNC-machined tool steel for exact fit, hardness and long service life.
    • Complete package: Includes spacer and 10 high-grade crown ring bolts for a hassle-free install.
    • Zero machining: Corrects crown-ring position differences between low-ratio and high-ratio carriers.
    • Proven use case: Ideal when sourcing desirable high-ratio LSD carriers from TDS models.
    Performance Benefits
    • Effortless ratio upgrades: Move to 3.15–4.45 for sharper acceleration and track gearing.
    • Factory-like mesh: Maintains proper ring-gear position to achieve correct backlash and contact pattern.
    • Reliable hardware: New crown ring bolts reduce the risk of reusing stretched/aged fasteners.
    Technical Specs / Installation Tips
    Application Swapping a low-ratio LSD carrier (≈2.64–3.07) into a high-ratio carrier housing (≈3.15–4.45).
    Typical platforms BMW E30 / E36 / E34 tds (188 mm medium case; confirm your carrier/housing before ordering).
    Material CNC-machined tool steel spacer + 10× high-grade crown ring bolts.
    Install notes Clean mating faces; seat spacer flat behind the ring gear.
    Use medium-strength threadlocker on crown ring bolts; torque in a star pattern to BMW spec.
    After assembly: set backlash to spec and verify contact pattern with marking compound.
    Re-check torque and backlash after first heat cycle/track session.
    What’s in the Box
    • 1 × Precision-crafted spacer
    • 10 × High-grade crown ring bolts