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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On Sale
Mercury Gear Case BASIC 25 2S OEM 8M0083538
Mercury
MSRP: $922.49Now: $813.39Was: $922.49Genuine Mercury Gear Case BASIC 25 2S, part number 8M0083538. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8669A10, 8669A2, 8669A21.8M0083538- SKU:
- 8M0083538
- Availability:
- Usually Ships within 24hours
- Weight:
- 224.00 Ounces
MSRP: $922.49Now: $813.39Was: $922.49 -
On Sale
Quicksilver Forward Gear Set Assy (Bravo One & Bravo One X) 14063A1
Quicksilver
MSRP: $899.99Now: $793.49Was: $899.99The Quicksilver Forward Gear Set 14063A1 is a genuine Quicksilver OEM replacement gear set designed for MerCruiser Bravo One and Bravo One X sterndrives. Manufactured to original equipment...14063A1- SKU:
- 14063A1
- Availability:
- Usually Ships within 24hours
- Weight:
- 64.43 Ounces
MSRP: $899.99Now: $793.49Was: $899.99 -
On Sale
Mercury DRIVESHAFT ASSY OEM 888434A1
Mercury
MSRP: $896.49Now: $790.52Was: $896.49Genuine Mercury DRIVESHAFT ASSY, part number 888434A1. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 812561A2.888434A1- SKU:
- 888434A1
- Availability:
- Usually Ships within 24hours
- Weight:
- 116.80 Ounces
MSRP: $896.49Now: $790.52Was: $896.49 -
On Sale
Mercury Alpha One Gen II Counter-Rotation Basic Gear Housing 815822A28
Mercury
MSRP: $892.86Now: $787.50Was: $892.86Mercury Alpha One Gen II Counter-Rotation Basic Gear Housing 815822A28 is a genuine Mercury OEM replacement gear housing for compatible MerCruiser Alpha One Gen II sterndrives. This is a...815822A28- SKU:
- 815822A28
- Availability:
- Usually Ships within 24hours
- Weight:
- 395.20 Ounces
MSRP: $892.86Now: $787.50Was: $892.86 -
On Sale
Mercury DRIVESHAFT ASSY OEM 858517A3
Mercury
MSRP: $792.99Now: $699.05Was: $792.99Genuine Mercury DRIVESHAFT ASSY, part number 858517A3. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 41629A2, 805370A1, 858517A1.858517A3- SKU:
- 858517A3
- Availability:
- Usually Ships within 24hours
- Weight:
- 100.00 Ounces
MSRP: $792.99Now: $699.05Was: $792.99 -
On Sale
Mercury Gear Case BASIC9.9/15 4S OEM 8M0083312
Mercury
MSRP: $770.49Now: $679.52Was: $770.49Genuine Mercury Gear Case BASIC9.9/15 4S, part number 8M0083312. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8833A17.8M0083312- SKU:
- 8M0083312
- Availability:
- Usually Ships within 24hours
- Weight:
- 120.00 Ounces
MSRP: $770.49Now: $679.52Was: $770.49 -
Mercury Engine Coupler Assembly for 4.5L & 6.2L MPI Bravo 8M0098795
Quicksilver
$744.49Mercury Engine Coupler Assembly 8M0098795 is a genuine Mercury/Quicksilver OEM replacement coupler designed for compatible 4.5L and 6.2L MPI Bravo sterndrive engines. The engine coupler transfers...8M0098795- SKU:
- 8M0098795
- Availability:
- Usually Ships within 24hours
- Weight:
- 204.24 Ounces
$744.49 -
On Sale
Mercury Gear Case BASIC 25/30 4S OEM 8M0057242
Mercury
MSRP: $740.49Now: $653.06Was: $740.49Genuine Mercury Gear Case BASIC 25/30 4S, part number 8M0057242. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 825132A4, 825132T04, 825132T29, 825132T34.8M0057242- SKU:
- 8M0057242
- Availability:
- Usually Ships within 24hours
- Weight:
- 145.60 Ounces
MSRP: $740.49Now: $653.06Was: $740.49 -
On Sale
Mercury Gear Case 40 2S SH INTL OEM 8M0127363
Mercury
MSRP: $735.70Now: $648.90Was: $735.70Genuine Mercury Gear Case 40 2S SH INTL, part number 8M0127363. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0119564.8M0127363- SKU:
- 8M0127363
- Availability:
- Usually Ships within 24hours
- Weight:
- 496.00 Ounces
MSRP: $735.70Now: $648.90Was: $735.70 -
On Sale
Mercury BASIC GEARCASE OEM 8M0135572
Mercury
MSRP: $726.99Now: $640.96Was: $726.99Genuine Mercury BASIC GEARCASE, part number 8M0135572. Designed for use with compatible applications.8M0135572- SKU:
- 8M0135572
- Availability:
- Usually Ships within 24hours
- Weight:
- 144.38 Ounces
MSRP: $726.99Now: $640.96Was: $726.99 -
On Sale
Mercury COVER-GEARCASE OEM 8M0177487
Mercury
MSRP: $699.49Now: $616.96Was: $699.49Genuine Mercury COVER-GEARCASE, part number 8M0177487. Designed for use with compatible applications.8M0177487- SKU:
- 8M0177487
- Availability:
- Usually Ships within 24hours
- Weight:
- 208.96 Ounces
MSRP: $699.49Now: $616.96Was: $699.49 -
On Sale
Mercury Flywheel Assembly 859238T16
Mercury
MSRP: $689.99Now: $608.27Was: $689.99Mercury Flywheel Assembly 859238T16 is a genuine Mercury OEM replacement flywheel designed for compatible Mercury marine engines. The flywheel stores rotational energy, provides a mounting surface...859238T16- SKU:
- 859238T16
- Availability:
- Usually Ships within 24hours
- Weight:
- 209.60 Ounces
MSRP: $689.99Now: $608.27Was: $689.99 -
On Sale
Mercury LOWER UNIT ASSY OEM M899360T
Mercury
MSRP: $579.69Now: $555.79Was: $579.69Genuine Mercury LOWER UNIT ASSY, part number M899360T. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: MCC397032.M899360T- SKU:
- M899360T
- Availability:
- Usually Ships within 24hours
- Weight:
- 215.52 Ounces
MSRP: $579.69Now: $555.79Was: $579.69 -
On Sale
Mercury Gear Case BASIC 15/20 4S OEM 8M0070875
Mercury
MSRP: $566.99Now: $500.09Was: $566.99Genuine Mercury Gear Case BASIC 15/20 4S, part number 8M0070875. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 879147T66.8M0070875- SKU:
- 8M0070875
- Availability:
- Usually Ships within 24hours
- Weight:
- 158.40 Ounces
MSRP: $566.99Now: $500.09Was: $566.99 -
On Sale
Mercury 5 HP SailPower Long Complete Gearcase 8M0188426
Mercury
MSRP: $564.49Now: $497.70Was: $564.49Mercury Complete Gearcase 8M0188426 is a genuine OEM replacement gearcase for applicable 5 HP Mercury and Mariner SailPower/SailMate outboards with a long shaft configuration. This assembly is used...8M0188426- SKU:
- 8M0188426
- Availability:
- Usually Ships within 24hours
- Weight:
- 176.00 Ounces
MSRP: $564.49Now: $497.70Was: $564.49 -
On Sale
Mercury GEAR HOUSING B XL OEM 8M0155388
Mercury
MSRP: $564.49Now: $497.70Was: $564.49Genuine Mercury GEAR HOUSING B XL, part number 8M0155388. Designed for use with compatible applications.8M0155388- SKU:
- 8M0155388
- Availability:
- Usually Ships within 24hours
- Weight:
- 208.00 Ounces
MSRP: $564.49Now: $497.70Was: $564.49 -
On Sale
Mercury Gear Case 4-5-6 4S B S OEM 8M0188408
Mercury
MSRP: $564.30Now: $497.70Was: $564.30Genuine Mercury Gear Case 4-5-6 4S B S, part number 8M0188408. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 810820, 825132A2, 825132T15, 8M0122302,...8M0188408- SKU:
- 8M0188408
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $564.30Now: $497.70Was: $564.30 -
On Sale
Mercury Gear Case 4-5 2S B L OEM 8M0188402
Mercury
MSRP: $564.30Now: $497.70Was: $564.30Genuine Mercury Gear Case 4-5 2S B L, part number 8M0188402. Designed for use with compatible applications.8M0188402- SKU:
- 8M0188402
- Availability:
- Usually Ships within 24hours
- Weight:
- 224.00 Ounces
MSRP: $564.30Now: $497.70Was: $564.30 -
On Sale
Mercury Gear Case 4-5-6HP B L OEM 8M0188414
Mercury
MSRP: $564.30Now: $497.70Was: $564.30Genuine Mercury Gear Case 4-5-6HP B L, part number 8M0188414. Designed for use with compatible applications.8M0188414- SKU:
- 8M0188414
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $564.30Now: $497.70Was: $564.30 -
On Sale
Mercury Gear Case 4-5 2S B L OEM 8M0155373
Mercury
MSRP: $564.30Now: $497.70Was: $564.30Genuine Mercury Gear Case 4-5 2S B L, part number 8M0155373. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 810822, 825132A3, 825132T16, 8M0122307,...8M0155373- SKU:
- 8M0155373
- Availability:
- Usually Ships within 24hours
- Weight:
- 232.00 Ounces
MSRP: $564.30Now: $497.70Was: $564.30
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