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 150 HP SeaPro Long Complete Gearcase 8M0099909
Mercury
MSRP: $6,678.55Now: $5,890.50Was: $6,678.55Mercury Complete Gearcase 8M0099909 is an OEM replacement lower unit designed specifically for select Mercury 150 HP EFI SeaPro FourStroke outboards. Mercury parts diagrams identify it as the8M0099909- SKU:
- 8M0099909
- Availability:
- Usually Ships within 24hours
- Weight:
- 960.00 Ounces
MSRP: $6,678.55Now: $5,890.50Was: $6,678.55 -
On Sale
Mercury Gear Case 3L DFI LONG OEM 8M0236250
Mercury
MSRP: $6,607.15Now: $5,827.50Was: $6,607.15Genuine Mercury Gear Case 3L DFI LONG, part number 8M0236250. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 880686A43, 880686T29.8M0236250- SKU:
- 8M0236250
- Availability:
- Usually Ships within 24hours
- Weight:
- 1,008.00 Ounces
MSRP: $6,607.15Now: $5,827.50Was: $6,607.15 -
On Sale
Mercury Gear Case SM BAS CMB C S OEM 8M0159715
Mercury
MSRP: $6,490.00Now: $5,720.40Was: $6,490.00Genuine Mercury Gear Case SM BAS CMB C S, part number 8M0159715. Designed for use with compatible applications.8M0159715- SKU:
- 8M0159715
- Availability:
- Usually Ships within 24hours
- Weight:
- 624.00 Ounces
MSRP: $6,490.00Now: $5,720.40Was: $6,490.00 -
On Sale
Mercury Gear Case SM BASIC CMB S OEM 8M0159713
Mercury
MSRP: $6,490.00Now: $5,720.40Was: $6,490.00Genuine Mercury Gear Case SM BASIC CMB S, part number 8M0159713. Designed for use with compatible applications.8M0159713- SKU:
- 8M0159713
- Availability:
- Usually Ships within 24hours
- Weight:
- 608.00 Ounces
MSRP: $6,490.00Now: $5,720.40Was: $6,490.00 -
On Sale
Mercury Gear Case SM BASIC GREY OEM 8M0159711
Mercury
MSRP: $6,450.00Now: $5,688.90Was: $6,450.00Genuine Mercury Gear Case SM BASIC GREY, part number 8M0159711. Designed for use with compatible applications.8M0159711- SKU:
- 8M0159711
- Availability:
- Usually Ships within 24hours
- Weight:
- 656.00 Ounces
MSRP: $6,450.00Now: $5,688.90Was: $6,450.00 -
On Sale
Mercury Gear Case SM BAS CMB C OEM 8M0187438
Mercury
MSRP: $6,165.00Now: $5,436.90Was: $6,165.00Genuine Mercury Gear Case SM BAS CMB C, part number 8M0187438. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0159714.8M0187438- SKU:
- 8M0187438
- Availability:
- Usually Ships within 24hours
- Weight:
- 656.00 Ounces
MSRP: $6,165.00Now: $5,436.90Was: $6,165.00 -
On Sale
Mercury MOTOR LOWER UNIT OEM 8M0230338
Mercury
MSRP: $6,029.99Now: $5,318.46Was: $6,029.99Genuine Mercury MOTOR LOWER UNIT, part number 8M0230338. Designed for use with compatible applications.8M0230338- SKU:
- 8M0230338
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $6,029.99Now: $5,318.46Was: $6,029.99 -
On Sale
Mercury MOTOR LOWER UNIT OEM 8M0230337
Mercury
MSRP: $6,018.99Now: $5,308.19Was: $6,018.99Genuine Mercury MOTOR LOWER UNIT, part number 8M0230337. Designed for use with compatible applications.8M0230337- SKU:
- 8M0230337
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $6,018.99Now: $5,308.19Was: $6,018.99 -
On Sale
Mercury MOTOR LOWER UNIT OEM 8M0230336
Mercury
MSRP: $6,006.99Now: $5,297.99Was: $6,006.99Genuine Mercury MOTOR LOWER UNIT, part number 8M0230336. Designed for use with compatible applications.8M0230336- SKU:
- 8M0230336
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $6,006.99Now: $5,297.99Was: $6,006.99 -
On Sale
Mercury Gear Case SM CMB C SILV OEM 8M0174033
Mercury
MSRP: $5,545.00Now: $4,888.80Was: $5,545.00Genuine Mercury Gear Case SM CMB C SILV, part number 8M0174033. Designed for use with compatible applications.8M0174033- SKU:
- 8M0174033
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $5,545.00Now: $4,888.80Was: $5,545.00 -
On Sale
Mercury GEAR HOUSING-SM OEM 840306T3
Mercury
MSRP: $5,345.00Now: $4,712.40Was: $5,345.00Genuine Mercury GEAR HOUSING-SM, part number 840306T3. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 840306A3, 849014A2, 849014T2.840306T3- SKU:
- 840306T3
- Availability:
- Usually Ships within 24hours
- Weight:
- 640.00 Ounces
MSRP: $5,345.00Now: $4,712.40Was: $5,345.00 -
On Sale
Mercury GEAR HOUSING-SM OEM 840307T3
Mercury
MSRP: $5,345.00Now: $4,712.40Was: $5,345.00Genuine Mercury GEAR HOUSING-SM, part number 840307T3. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 840307A3, 849015A2, 849015T2.840307T3- SKU:
- 840307T3
- Availability:
- Usually Ships within 24hours
- Weight:
- 464.00 Ounces
MSRP: $5,345.00Now: $4,712.40Was: $5,345.00 -
Mercury GEAR HOUSING ASSY OEM 8M0176565
Mercury
$5,196.97Genuine Mercury GEAR HOUSING ASSY, part number 8M0176565. Designed for use with compatible applications.8M0176565- SKU:
- 8M0176565
- Availability:
- Usually Ships within 24hours
- Weight:
- 186.88 Ounces
$5,196.97 -
Mercury CPO Gear Case V8-175-CXL OEM 8M0159738
Mercury
$4,956.25Genuine Mercury CPO Gear Case V8-175-CXL, part number 8M0159738. Designed for use with compatible applications.8M0159738- SKU:
- 8M0159738
- Availability:
- Usually Ships within 24hours
- Weight:
- 1,104.00 Ounces
$4,956.25 -
Mercury CPO Gear Case V8-175-XXL OEM 8M0159739
Mercury
$4,956.25Genuine Mercury CPO Gear Case V8-175-XXL, part number 8M0159739. Designed for use with compatible applications.8M0159739- SKU:
- 8M0159739
- Availability:
- Usually Ships within 24hours
- Weight:
- 1,168.00 Ounces
$4,956.25 -
Mercury CPO Gear Case V8-175-CXX OEM 8M0159740
Mercury
$4,956.25Genuine Mercury CPO Gear Case V8-175-CXX, part number 8M0159740. Designed for use with compatible applications.8M0159740- SKU:
- 8M0159740
- Availability:
- Usually Ships within 24hours
- Weight:
- 1,200.00 Ounces
$4,956.25 -
On Sale
Mercury Gear Case ASY-L SLVR CT OEM 8M0227982
Mercury
MSRP: $4,950.00Now: $4,365.90Was: $4,950.00Genuine Mercury Gear Case ASY-L SLVR CT, part number 8M0227982. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0144825.8M0227982- SKU:
- 8M0227982
- Availability:
- Usually Ships within 24hours
- Weight:
- 956.80 Ounces
MSRP: $4,950.00Now: $4,365.90Was: $4,950.00 -
On Sale
Mercury 115 Pro XS Command Thrust 2.38:1 X-Long Complete Gearcase (Silver) 8M0227983
Mercury
MSRP: $4,950.00Now: $4,365.90Was: $4,950.00Mercury Complete Gearcase 8M0227983 is a genuine OEM replacement gearcase for compatible Mercury 115 HP Pro XS FourStroke outboards with the Command Thrust gearcase. This configuration features a 2...8M0227983- SKU:
- 8M0227983
- Availability:
- Usually Ships within 24hours
- Weight:
- 944.00 Ounces
MSRP: $4,950.00Now: $4,365.90Was: $4,950.00 -
On Sale
Mercury Gear Case ASSY-L SLVR ST OEM 8M0227980
Mercury
MSRP: $4,950.00Now: $4,365.90Was: $4,950.00Genuine Mercury Gear Case ASSY-L SLVR ST, part number 8M0227980. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0144823.8M0227980- SKU:
- 8M0227980
- Availability:
- Usually Ships within 24hours
- Weight:
- 976.00 Ounces
MSRP: $4,950.00Now: $4,365.90Was: $4,950.00 -
On Sale
Mercury Gear Case ASY-XL SLVR ST OEM 8M0227981
Mercury
MSRP: $4,950.00Now: $4,365.90Was: $4,950.00Genuine Mercury Gear Case ASY-XL SLVR ST, part number 8M0227981. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0144824.8M0227981- SKU:
- 8M0227981
- Availability:
- Usually Ships within 24hours
- Weight:
- 1,040.00 Ounces
MSRP: $4,950.00Now: $4,365.90Was: $4,950.00
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