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Lower Units & Gearcases

Lower Units & Gearcases

Lower Units & Gearcases

Shop genuine Mercury lower units, complete gearcase assemblies, and replacement gearcase components for a variety of Mercury outboard applications. Find OEM gearcases and related components designed for proper fitment and reliable performance.

Mercury gearcase fitment can vary by engine serial number, model, shaft length, gear ratio, rotation, and application. If you're not sure which lower unit you need, visit our Lower Unit & Gearcase Guide to learn more about fitment and replacement options.

Need help confirming fitment? Have your engine serial number ready and contact our team at (727) 596-5929.

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  • Qty in Cart
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  • On Sale
    MERCURY OEM GC BASIC SILVER, 8M0228040
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    Mercury Gear Case BASIC SILVER OEM 8M0228040

    Mercury

    MSRP: $4,828.49
    Now: $4,258.74
    Was: $4,828.49
    Genuine Mercury Gear Case BASIC SILVER, part number 8M0228040. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0142888.
    8M0228040
    SKU:
    8M0228040
    Availability:
    Usually Ships within 24hours
    Weight:
    1,424.00 Ounces
    MSRP: $4,828.49
    Now: $4,258.74
    Was: $4,828.49
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    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,828.49
    Now: $4,258.74
    Was: $4,828.49
    Subtotal:
    Add to Cart
  • On Sale
    MERCURY OEM GC BASIC SIL CAM, 8M0228042
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    Mercury Gear Case BASIC SIL CAM OEM 8M0228042

    Mercury

    MSRP: $4,619.99
    Now: $4,074.78
    Was: $4,619.99
    Genuine Mercury Gear Case BASIC SIL CAM, part number 8M0228042. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0145769.
    8M0228042
    SKU:
    8M0228042
    Availability:
    Usually Ships within 24hours
    Weight:
    512.00 Ounces
    MSRP: $4,619.99
    Now: $4,074.78
    Was: $4,619.99
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,619.99
    Now: $4,074.78
    Was: $4,619.99
    Subtotal:
    Add to Cart
  • On Sale
    MERCURY OEM GC BASIC SIL CAM, 8M0228043
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    Mercury Gear Case BASIC SIL CAM OEM 8M0228043

    Mercury

    MSRP: $4,584.99
    Now: $4,043.66
    Was: $4,584.99
    Genuine Mercury Gear Case BASIC SIL CAM, part number 8M0228043. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0145770.
    8M0228043
    SKU:
    8M0228043
    Availability:
    Usually Ships within 24hours
    Weight:
    512.00 Ounces
    MSRP: $4,584.99
    Now: $4,043.66
    Was: $4,584.99
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,584.99
    Now: $4,043.66
    Was: $4,584.99
    Subtotal:
    Add to Cart
  • On Sale
    Mercury 150 HP FourStroke Counter-Rotation Complete Gearcase 8M0107156
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    Mercury 150 HP FourStroke Counter-Rotation Complete Gearcase 8M0107156

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0107156 is a genuine Mercury OEM replacement lower unit for select Mercury 150 HP EFI FourStroke outboards. This assembly is the counter-rotation (CXL) configu
    8M0107156
    SKU:
    8M0107156
    Availability:
    Usually Ships within 24hours
    Weight:
    1,008.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    Mercury Command Thrust Counter-Rotation Complete Gearcase 8M0102751
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    Mercury Command Thrust Counter-Rotation Complete Gearcase 8M0102751

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0102751 is a genuine Mercury OEM replacement lower unit for select 65-115 HP EFI FourStroke outboards equipped with a Command Thrust counter-rotation gearcase<
    8M0102751
    SKU:
    8M0102751
    Availability:
    Usually Ships within 24hours
    Weight:
    1,008.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    Mercury SeaPro Command Thrust Counter-Rotation Complete Gearcase 8M0099917
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    Mercury SeaPro Command Thrust Counter-Rotation Complete Gearcase 8M0099917

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0099917 is a genuine Mercury OEM replacement lower unit for select Mercury EFI SeaPro FourStroke outboards. This SeaPro-specific assembly features a 2.38:1 Com
    8M0099917
    SKU:
    8M0099917
    Availability:
    Usually Ships within 24hours
    Weight:
    992.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    Mercury SeaPro Command Thrust XL Complete Gearcase 8M0099916
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    Mercury SeaPro Command Thrust XL Complete Gearcase 8M0099916

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0099916 is a genuine Mercury OEM replacement lower unit for select Mercury 65-115 HP EFI FourStroke SeaPro outboards. This SeaPro-specific assembly features a
    8M0099916
    SKU:
    8M0099916
    Availability:
    Usually Ships within 24hours
    Weight:
    992.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    Mercury SeaPro Command Thrust Long Complete Gearcase 8M0099915
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    Mercury SeaPro Command Thrust Long Complete Gearcase 8M0099915

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0099915 is a genuine Mercury OEM replacement lower unit for select Mercury 65-115 HP EFI FourStroke SeaPro outboards. This SeaPro-specific assembly features a
    8M0099915
    SKU:
    8M0099915
    Availability:
    Usually Ships within 24hours
    Weight:
    960.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    Mercury 150 HP FourStroke XL Complete Gearcase 8M0099221
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    Mercury 150 HP FourStroke XL Complete Gearcase 8M0099221

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0099221 is a genuine Mercury OEM replacement lower unit for select Mercury 150 HP FourStroke outboards. This complete assembly features a 1.92:1 gear ratio, st
    8M0099221
    SKU:
    8M0099221
    Availability:
    Usually Ships within 24hours
    Weight:
    976.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    Mercury 135-150 HP FourStroke Long Complete Gearcase 8M0099218
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    Mercury 135-150 HP FourStroke Long Complete Gearcase 8M0099218

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0099218 is a genuine Mercury OEM replacement lower unit for select Mercury and Mariner 135-150 HP EFI FourStroke outboards. This assembly is the standard-rotation Long...
    8M0099218
    SKU:
    8M0099218
    Availability:
    Usually Ships within 24hours
    Weight:
    960.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    Mercury Command Thrust Counter-Rotation Complete Gearcase 8M0088076
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    Mercury Command Thrust Counter-Rotation Complete Gearcase 8M0088076

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0088076 is a genuine Mercury OEM replacement lower unit for select 65-115 HP EFI FourStroke outboards equipped with the Command Thrust gearcase. This
    8M0088076
    SKU:
    8M0088076
    Availability:
    Usually Ships within 24hours
    Weight:
    1,008.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    Mercury Command Thrust XL Complete Gearcase 8M0088075
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    Mercury Command Thrust XL Complete Gearcase 8M0088075

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0088075 is a genuine Mercury OEM replacement lower unit for select 65-115 HP EFI FourStroke outboards equipped with a Command Thrust gearcase. This as
    8M0088075
    SKU:
    8M0088075
    Availability:
    Usually Ships within 24hours
    Weight:
    976.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    Mercury Command Thrust Long Complete Gearcase 8M0088073
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    Mercury Command Thrust Long Complete Gearcase 8M0088073

    Mercury

    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Mercury Complete Gearcase 8M0088073 is a genuine Mercury OEM replacement lower unit for select 65-115 HP EFI FourStroke outboards equipped with a Command Thrust gearcase. This as
    8M0088073
    SKU:
    8M0088073
    Availability:
    Usually Ships within 24hours
    Weight:
    960.00 Ounces
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,535.70
    Now: $4,000.50
    Was: $4,535.70
    Subtotal:
    Add to Cart
  • On Sale
    MERCURY OEM GC-BASIC CHMBR CF, 8M0219311
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    Mercury Gear Case-BASIC CHMBR CF OEM 8M0219311

    Mercury

    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Genuine Mercury Gear Case-BASIC CHMBR CF, part number 8M0219311. Designed for use with compatible applications.
    8M0219311
    SKU:
    8M0219311
    Availability:
    Usually Ships within 24hours
    Weight:
    0.00 Ounces
    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Subtotal:
    Add to Cart
  • On Sale
    MERCURY OEM GC-BASIC STD CF, 8M0219309
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    Mercury Gear Case-BASIC STD CF OEM 8M0219309

    Mercury

    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Genuine Mercury Gear Case-BASIC STD CF, part number 8M0219309. Designed for use with compatible applications.
    8M0219309
    SKU:
    8M0219309
    Availability:
    Usually Ships within 24hours
    Weight:
    0.00 Ounces
    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Subtotal:
    Add to Cart
  • On Sale
    MERCURY OEM GC-BASIC CHMBR CF, 8M0219307
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    Mercury Gear Case-BASIC CHMBR CF OEM 8M0219307

    Mercury

    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Genuine Mercury Gear Case-BASIC CHMBR CF, part number 8M0219307. Designed for use with compatible applications.
    8M0219307
    SKU:
    8M0219307
    Availability:
    Usually Ships within 24hours
    Weight:
    0.00 Ounces
    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Subtotal:
    Add to Cart
  • On Sale
    MERCURY OEM GC-BASIC STD CF, 8M0219305
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    Quick view

    Mercury Gear Case-BASIC STD CF OEM 8M0219305

    Mercury

    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Genuine Mercury Gear Case-BASIC STD CF, part number 8M0219305. Designed for use with compatible applications.
    8M0219305
    SKU:
    8M0219305
    Availability:
    Usually Ships within 24hours
    Weight:
    672.00 Ounces
    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,525.00
    Now: $3,987.90
    Was: $4,525.00
    Subtotal:
    Add to Cart
  • On Sale
    MERCURY OEM GC-BRV 4S-BASIC, 8M0174812
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    Mercury Gear Case-BRV 4S-BASIC OEM 8M0174812

    Mercury

    MSRP: $4,359.50
    Now: $3,845.08
    Was: $4,359.50
    Genuine Mercury Gear Case-BRV 4S-BASIC, part number 8M0174812. Designed for use with compatible applications.
    8M0174812
    SKU:
    8M0174812
    Availability:
    Usually Ships within 24hours
    Weight:
    544.00 Ounces
    MSRP: $4,359.50
    Now: $3,845.08
    Was: $4,359.50
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,359.50
    Now: $3,845.08
    Was: $4,359.50
    Subtotal:
    Add to Cart
  • On Sale
    Mercury SeaPro 60 HP 2.33:1 X-Long Complete Gearcase 8M0118188
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    Mercury SeaPro 60 HP 2.33:1 X-Long Complete Gearcase 8M0118188

    Mercury

    MSRP: $4,292.85
    Now: $3,786.30
    Was: $4,292.85
    Mercury SeaPro Complete Gearcase 8M0118188 is a genuine OEM replacement gearcase for compatible Mercury 60 HP SeaPro FourStroke outboards. This configuration features a 2.33:1 gear ratio and X-Long...
    8M0118188
    SKU:
    8M0118188
    Availability:
    Usually Ships within 24hours
    Weight:
    992.00 Ounces
    MSRP: $4,292.85
    Now: $3,786.30
    Was: $4,292.85
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,292.85
    Now: $3,786.30
    Was: $4,292.85
    Subtotal:
    Add to Cart
  • On Sale
    Mercury 40-60 HP FourStroke Long Complete Gearcase 8M0118186
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    Mercury 40-60 HP FourStroke Long Complete Gearcase 8M0118186

    Mercury

    MSRP: $4,292.85
    Now: $3,786.30
    Was: $4,292.85
    Mercury Complete Gearcase 8M0118186 is a genuine OEM replacement gearcase for compatible Mercury 40-60 HP FourStroke outboards. This configuration is the Long shaft version for standard-rotation...
    8M0118186
    SKU:
    8M0118186
    Availability:
    Usually Ships within 24hours
    Weight:
    960.00 Ounces
    MSRP: $4,292.85
    Now: $3,786.30
    Was: $4,292.85
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $4,292.85
    Now: $3,786.30
    Was: $4,292.85
    Subtotal:
    Add to Cart
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