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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- Price
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On Sale
Mercury GEAR HOUSING OEM 8M0122304
Mercury
MSRP: $564.30Now: $497.70Was: $564.30Genuine Mercury GEAR HOUSING, part number 8M0122304. Designed for use with compatible applications.8M0122304- SKU:
- 8M0122304
- Availability:
- Usually Ships within 24hours
- Weight:
- 216.00 Ounces
MSRP: $564.30Now: $497.70Was: $564.30 -
On Sale
Mercury Gear Case 4-5-6 2S 4S L OEM 8M0122308
Mercury
MSRP: $564.30Now: $497.70Was: $564.30Genuine Mercury Gear Case 4-5-6 2S 4S L, part number 8M0122308. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0128323, 9621A2, 9621T2, 9621T5.8M0122308- SKU:
- 8M0122308
- Availability:
- Usually Ships within 24hours
- Weight:
- 181.01 Ounces
MSRP: $564.30Now: $497.70Was: $564.30 -
On Sale
Mercury Gear Case 4/5/6 4S XLONG OEM 8M0063900
Mercury
MSRP: $564.30Now: $497.70Was: $564.30Genuine Mercury Gear Case 4/5/6 4S XLONG, part number 8M0063900. Designed for use with compatible applications.8M0063900- SKU:
- 8M0063900
- Availability:
- Usually Ships within 24hours
- Weight:
- 208.00 Ounces
MSRP: $564.30Now: $497.70Was: $564.30 -
Mercury Gear Case 25-30 4S B L OEM 8M0187032
Mercury
$562.50Genuine Mercury Gear Case 25-30 4S B L, part number 8M0187032. Designed for use with compatible applications.8M0187032- SKU:
- 8M0187032
- Availability:
- Usually Ships within 24hours
- Weight:
- 352.00 Ounces
$562.50 -
Mercury Gear Case 25-30 4S B S OEM 8M0187031
Mercury
$562.50Genuine Mercury Gear Case 25-30 4S B S, part number 8M0187031. Designed for use with compatible applications.8M0187031- SKU:
- 8M0187031
- Availability:
- Usually Ships within 24hours
- Weight:
- 352.00 Ounces
$562.50 -
Mercury Gear Case 25-30 4S B XL OEM 8M0187033
Mercury
$562.50Genuine Mercury Gear Case 25-30 4S B XL, part number 8M0187033. Designed for use with compatible applications.8M0187033- SKU:
- 8M0187033
- Availability:
- Usually Ships within 24hours
- Weight:
- 368.00 Ounces
$562.50 -
On Sale
Mercury Gear Case BASIC 8/9.9 4S OEM 8M0070873
Mercury
MSRP: $557.49Now: $491.40Was: $557.49Genuine Mercury Gear Case BASIC 8/9.9 4S, part number 8M0070873. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 895154T06.8M0070873- SKU:
- 8M0070873
- Availability:
- Usually Ships within 24hours
- Weight:
- 160.00 Ounces
MSRP: $557.49Now: $491.40Was: $557.49 -
On Sale
Mercury GEAR HOUSING OEM 8M0131735
Mercury
MSRP: $553.49Now: $487.81Was: $553.49Genuine Mercury GEAR HOUSING, part number 8M0131735. Designed for use with compatible applications.8M0131735- SKU:
- 8M0131735
- Availability:
- Usually Ships within 24hours
- Weight:
- 256.00 Ounces
MSRP: $553.49Now: $487.81Was: $553.49 -
On Sale
Mercury GEAR HOUSING B L OEM 8M0155377
Mercury
MSRP: $550.00Now: $485.10Was: $550.00Genuine Mercury GEAR HOUSING B L, part number 8M0155377. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0122303, 8M0128320.8M0155377- SKU:
- 8M0155377
- Availability:
- Usually Ships within 24hours
- Weight:
- 175.68 Ounces
MSRP: $550.00Now: $485.10Was: $550.00 -
On Sale
Mercury TOOL-GEARCASE PIN OEM 8M2005712
Mercury
MSRP: $526.49Now: $447.52Was: $526.49Genuine Mercury TOOL-GEARCASE PIN, part number 8M2005712. Designed for use with compatible applications.8M2005712- SKU:
- 8M2005712
- Availability:
- Usually Ships within 24hours
- Weight:
- 104.00 Ounces
MSRP: $526.49Now: $447.52Was: $526.49 -
On Sale
Mercury LOWER UNIT OEM 8M4005024
Mercury
MSRP: $518.16Now: $496.63Was: $518.16Genuine Mercury LOWER UNIT, part number 8M4005024. Designed for use with compatible applications.8M4005024- SKU:
- 8M4005024
- Availability:
- Usually Ships within 24hours
- Weight:
- 288.00 Ounces
MSRP: $518.16Now: $496.63Was: $518.16 -
On Sale
Mercury Gear Case 8/9.9 4S BASIC OEM 8M0158623
Mercury
MSRP: $497.99Now: $438.98Was: $497.99Genuine Mercury Gear Case 8/9.9 4S BASIC, part number 8M0158623. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 895154T01.8M0158623- SKU:
- 8M0158623
- Availability:
- Usually Ships within 24hours
- Weight:
- 96.00 Ounces
MSRP: $497.99Now: $438.98Was: $497.99 -
On Sale
Mercury LOWER UNIT OEM 8M4005023
Mercury
MSRP: $482.99Now: $463.05Was: $482.99Genuine Mercury LOWER UNIT, part number 8M4005023. Designed for use with compatible applications.8M4005023- SKU:
- 8M4005023
- Availability:
- Usually Ships within 24hours
- Weight:
- 272.00 Ounces
MSRP: $482.99Now: $463.05Was: $482.99 -
On Sale
Mercury Gear Case BASIC 6-9.8 2S OEM 803729A14
Mercury
MSRP: $457.99Now: $403.58Was: $457.99Genuine Mercury Gear Case BASIC 6-9.8 2S, part number 803729A14. Designed for use with compatible applications.803729A14- SKU:
- 803729A14
- Availability:
- Usually Ships within 24hours
- Weight:
- 113.60 Ounces
MSRP: $457.99Now: $403.58Was: $457.99 -
On Sale
Mercury Gear Case-SUPPORT KIT OEM 8M0155308
Mercury
MSRP: $437.49Now: $385.50Was: $437.49Genuine Mercury Gear Case-SUPPORT KIT, part number 8M0155308. Designed for use with compatible applications.8M0155308- SKU:
- 8M0155308
- Availability:
- Usually Ships within 24hours
- Weight:
- 46.80 Ounces
MSRP: $437.49Now: $385.50Was: $437.49 -
On Sale
Mercury Gear Case 2.5-3.3 2S L OEM 8M0122312
Mercury
MSRP: $407.15Now: $359.10Was: $407.15Genuine Mercury Gear Case 2.5-3.3 2S L, part number 8M0122312. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 823822, 825126A3, 825126T05.8M0122312- SKU:
- 8M0122312
- Availability:
- Usually Ships within 24hours
- Weight:
- 176.00 Ounces
MSRP: $407.15Now: $359.10Was: $407.15 -
On Sale
Mercury Gear Case 2-3.5 4S L OEM 8M0122310
Mercury
MSRP: $407.15Now: $359.10Was: $407.15Genuine Mercury Gear Case 2-3.5 4S L, part number 8M0122310. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 898103T74, 8M0116856.8M0122310- SKU:
- 8M0122310
- Availability:
- Usually Ships within 24hours
- Weight:
- 192.00 Ounces
MSRP: $407.15Now: $359.10Was: $407.15 -
On Sale
Mercury Gear Case 2.5-3.3 2S S OEM 8M0122311
Mercury
MSRP: $407.15Now: $359.10Was: $407.15Genuine Mercury Gear Case 2.5-3.3 2S S, part number 8M0122311. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 823821, 825126A2, 825126T04.8M0122311- SKU:
- 8M0122311
- Availability:
- Usually Ships within 24hours
- Weight:
- 160.00 Ounces
MSRP: $407.15Now: $359.10Was: $407.15 -
On Sale
Mercury Gear Case 2-3.5 4S S OEM 8M0122309
Mercury
MSRP: $407.15Now: $359.10Was: $407.15Genuine Mercury Gear Case 2-3.5 4S S, part number 8M0122309. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 898103T73, 8M0116854.8M0122309- SKU:
- 8M0122309
- Availability:
- Usually Ships within 24hours
- Weight:
- 160.00 Ounces
MSRP: $407.15Now: $359.10Was: $407.15 -
On Sale
Mercury DRIVE ASSY OEM 888329A1
Mercury
MSRP: $353.99Now: $300.89Was: $353.99Genuine Mercury DRIVE ASSY, part number 888329A1. Designed for use with compatible applications.888329A1- SKU:
- 888329A1
- Availability:
- Usually Ships within 24hours
- Weight:
- 3.01 Ounces
MSRP: $353.99Now: $300.89Was: $353.99
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