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 Case BASIC OEM 8M0187015
Mercury
MSRP: $348.99Now: $296.64Was: $348.99Genuine Mercury Gear Case BASIC, part number 8M0187015. Designed for use with compatible applications.8M0187015- SKU:
- 8M0187015
- Availability:
- Usually Ships within 24hours
- Weight:
- 160.00 Ounces
MSRP: $348.99Now: $296.64Was: $348.99 -
On Sale
Mercury LOWER UNIT ASSY OEM M899444T
Mercury
MSRP: $285.99Now: $274.43Was: $285.99Genuine Mercury LOWER UNIT ASSY, part number M899444T. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: MEF397062, MPF397032.M899444T- SKU:
- M899444T
- Availability:
- Usually Ships within 24hours
- Weight:
- 177.28 Ounces
MSRP: $285.99Now: $274.43Was: $285.99 -
On Sale
Mercury Gear Case 4-5 2S B S OEM 8M0188396
Mercury
MSRP: $285.70Now: $252.00Was: $285.70Genuine Mercury Gear Case 4-5 2S B S, part number 8M0188396. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0122306, 8M0128319, 8M0155371.8M0188396- SKU:
- 8M0188396
- Availability:
- Usually Ships within 24hours
- Weight:
- 224.00 Ounces
MSRP: $285.70Now: $252.00Was: $285.70 -
On Sale
Mercury Gear Case 2-3.5 4S SH OEM 8M0116852
Mercury
MSRP: $207.15Now: $182.70Was: $207.15Genuine Mercury Gear Case 2-3.5 4S SH, part number 8M0116852. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 898103T64.8M0116852- SKU:
- 8M0116852
- Availability:
- Usually Ships within 24hours
- Weight:
- 35.20 Ounces
MSRP: $207.15Now: $182.70Was: $207.15 -
On Sale
Mercury GEAR HOUSING-SP OEM 9621T6
Mercury
MSRP: $207.15Now: $182.70Was: $207.15Genuine Mercury GEAR HOUSING-SP, part number 9621T6. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 9621, 9621A1.9621T6- SKU:
- 9621T6
- Availability:
- Usually Ships within 24hours
- Weight:
- 52.80 Ounces
MSRP: $207.15Now: $182.70Was: $207.15 -
On Sale
Mercury GEARCASE SEAL KIT OEM 8M0200137
Mercury
MSRP: $198.49Now: $168.72Was: $198.49Genuine Mercury GEARCASE SEAL KIT, part number 8M0200137. Designed for use with compatible applications.8M0200137- SKU:
- 8M0200137
- Availability:
- Usually Ships within 24hours
- Weight:
- 11.36 Ounces
MSRP: $198.49Now: $168.72Was: $198.49 -
On Sale
Mercury GEARCASE SEAL KIT OEM 8M0166531
Mercury
MSRP: $179.06Now: $157.88Was: $179.06Genuine Mercury GEARCASE SEAL KIT, part number 8M0166531. Designed for use with compatible applications.8M0166531- SKU:
- 8M0166531
- Availability:
- Usually Ships within 24hours
- Weight:
- 9.20 Ounces
MSRP: $179.06Now: $157.88Was: $179.06 -
On Sale
Mercury MOTOR LOWER UNIT OEM 8M0204409
Mercury
MSRP: $161.99Now: $137.69Was: $161.99Genuine Mercury MOTOR LOWER UNIT, part number 8M0204409. Designed for use with compatible applications.8M0204409- SKU:
- 8M0204409
- Availability:
- Usually Ships within 24hours
- Weight:
- 53.12 Ounces
MSRP: $161.99Now: $137.69Was: $161.99 -
On Sale
Mercury SEAL KIT GEARCASE OEM 8M0240768
Mercury
MSRP: $161.58Now: $137.34Was: $161.58Genuine Mercury SEAL KIT GEARCASE, part number 8M0240768. Designed for use with compatible applications.8M0240768- SKU:
- 8M0240768
- Availability:
- Usually Ships within 24hours
- Weight:
- 8.64 Ounces
MSRP: $161.58Now: $137.34Was: $161.58 -
On Sale
Mercury GEARCASE SEAL KIT OEM 8M0142979
Mercury
MSRP: $158.49Now: $134.72Was: $158.49Genuine Mercury GEARCASE SEAL KIT, part number 8M0142979. Designed for use with compatible applications.8M0142979- SKU:
- 8M0142979
- Availability:
- Usually Ships within 24hours
- Weight:
- 10.24 Ounces
MSRP: $158.49Now: $134.72Was: $158.49 -
On Sale
Mercury LOWER UNIT ASSY OEM MHM39706T
Mercury
MSRP: $147.99Now: $141.75Was: $147.99Genuine Mercury LOWER UNIT ASSY, part number MHM39706T. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8243141, 852899E, M899411T, M899724T, MFF397042,...MHM39706T- SKU:
- MHM39706T
- Availability:
- Usually Ships within 24hours
- Weight:
- 123.20 Ounces
MSRP: $147.99Now: $141.75Was: $147.99 -
On Sale
Mercury GEAR ASSY DRIVER OEM 8M0142414
Mercury
MSRP: $142.49Now: $121.12Was: $142.49Genuine Mercury GEAR ASSY DRIVER, part number 8M0142414. Designed for use with compatible applications.8M0142414- SKU:
- 8M0142414
- Availability:
- Usually Ships within 24hours
- Weight:
- 13.20 Ounces
MSRP: $142.49Now: $121.12Was: $142.49 -
On Sale
Mercury GEARCASE SEAL KIT OEM 8M0088081
Mercury
MSRP: $120.99Now: $102.84Was: $120.99Genuine Mercury GEARCASE SEAL KIT, part number 8M0088081. Designed for use with compatible applications.8M0088081- SKU:
- 8M0088081
- Availability:
- Usually Ships within 24hours
- Weight:
- 8.40 Ounces
MSRP: $120.99Now: $102.84Was: $120.99 -
On Sale
Mercury SM HP GEARCASE OEM 842009
Mercury
MSRP: $114.00Now: $100.17Was: $114.00Genuine Mercury SM HP GEARCASE, part number 842009. Designed for use with compatible applications.842009- SKU:
- 842009
- Availability:
- Usually Ships within 24hours
- Weight:
- 32.00 Ounces
MSRP: $114.00Now: $100.17Was: $114.00 -
On Sale
Mercury GEARCASE SEAL KIT OEM 8M0088080
Mercury
MSRP: $109.49Now: $93.07Was: $109.49Genuine Mercury GEARCASE SEAL KIT, part number 8M0088080. Designed for use with compatible applications.8M0088080- SKU:
- 8M0088080
- Availability:
- Usually Ships within 24hours
- Weight:
- 3.70 Ounces
MSRP: $109.49Now: $93.07Was: $109.49 -
On Sale
Mercury GEAR ASSY-DRIVE OEM 14513A09
Mercury
MSRP: $103.99Now: $88.39Was: $103.99Genuine Mercury GEAR ASSY-DRIVE, part number 14513A09. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 14513A2, 14513A3.14513A09- SKU:
- 14513A09
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.13 Ounces
MSRP: $103.99Now: $88.39Was: $103.99 -
On Sale
Mercury DRIVE ASSY OEM 803945
Mercury
MSRP: $100.49Now: $85.42Was: $100.49Genuine Mercury DRIVE ASSY, part number 803945. Designed for use with compatible applications.803945- SKU:
- 803945
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.75 Ounces
MSRP: $100.49Now: $85.42Was: $100.49 -
On Sale
Mercury BRACKET Gear Case FILL OEM 8M0179250
Mercury
MSRP: $92.99Now: $79.04Was: $92.99Genuine Mercury BRACKET Gear Case FILL, part number 8M0179250. Designed for use with compatible applications.8M0179250- SKU:
- 8M0179250
- Availability:
- Usually Ships within 24hours
- Weight:
- 5.60 Ounces
MSRP: $92.99Now: $79.04Was: $92.99 -
On Sale
Mercury GEARCASE SEAL KIT OEM 8M0057716
Mercury
MSRP: $86.99Now: $73.94Was: $86.99Genuine Mercury GEARCASE SEAL KIT, part number 8M0057716. Designed for use with compatible applications.8M0057716- SKU:
- 8M0057716
- Availability:
- Usually Ships within 24hours
- Weight:
- 5.44 Ounces
MSRP: $86.99Now: $73.94Was: $86.99 -
On Sale
Mercury GEARCASE SEAL SET OEM 8M0187013
Mercury
MSRP: $83.49Now: $70.97Was: $83.49Genuine Mercury GEARCASE SEAL SET, part number 8M0187013. Designed for use with compatible applications.8M0187013- SKU:
- 8M0187013
- Availability:
- Usually Ships within 24hours
- Weight:
- 1.28 Ounces
MSRP: $83.49Now: $70.97Was: $83.49
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