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    • Eaton Posi Clutch-Type Limited-Slip Differential | GM 8.5in/8.6in 10-Bolt 30-Spline | 19559-010
    • Eaton Posi Clutch-Type Limited-Slip Differential | GM 8.5in/8.6in 10-Bolt 30-Spline | 19559-010
    • Eaton Posi Clutch-Type Limited-Slip Differential | GM 8.5in/8.6in 10-Bolt 30-Spline | 19559-010
    • Eaton Posi Clutch-Type Limited-Slip Differential | GM 8.5in/8.6in 10-Bolt 30-Spline | 19559-010
    • Eaton Posi Clutch-Type Limited-Slip Differential | GM 8.5in/8.6in 10-Bolt 30-Spline | 19559-010
    • Eaton Posi Clutch-Type Limited-Slip Differential | GM 8.5in/8.6in 10-Bolt 30-Spline | 19559-010
    • Eaton Posi Clutch-Type Limited-Slip Differential | GM 8.5in/8.6in 10-Bolt 30-Spline | 19559-010
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    Eaton Posi Clutch-Type Limited-Slip Differential | GM 8.5in/8.6in 10-Bolt 30-Spline | 19559-010

    Vendor: Eaton
    Part Number: 19559-010
    Save $15.01
    Sale Price $750.99 Regular Price $766.00

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    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
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    The Eaton Posi 19559-010 is a clutch-type limited-slip differential for the GM 8.5 inch and 8.6 inch 10-bolt axle with 30-spline axle shafts. It uses race-bred carbon friction discs in a fully rebuildable housing, and the clutch preload is tunable by swapping spring packs, so the traction bias can be dialed in for the application.

    • Type: Clutch-type limited-slip differential (Eaton Posi)
    • Axle: GM 8.5in / 8.6in 10-bolt
    • Ring gear diameter: 8.5 in / 8.6 in
    • Axle shaft diameter: 1.32 in
    • Spline count: 30
    • Gear ratio: 2.73 and numerically higher
    • Rebuildable: yes, tunable clutch preload
    • Part number: 19559-010

    Axle Fitment

    • Fits the GM 8.5in/8.6in 10-bolt axle (30-spline, 2.73 and up), front or rear, used across many GM cars and trucks. Confirm your axle and spline count.

    FAQ

    What axle does the 19559-010 fit?

    The GM 8.5in and 8.6in 10-bolt axle with 30-spline shafts.

    Is it rebuildable?

    Yes. The Posi uses replaceable carbon friction discs and a rebuildable housing, with preload tunable by spring packs.

    What ratios does it cover?

    The 2.73 and numerically higher ratio range for this axle.

    How do I confirm fitment?

    Confirm you have a GM 8.5in or 8.6in 10-bolt axle with 30-spline shafts before ordering.

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
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    Read the full Shipping Policy

    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

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    For any questions or concerns, please contact us — we’re always happy to help.

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