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 5.44 BASIC GRE OEM 8M0176878
Mercury
MSRP: $2,770.00Now: $2,444.40Was: $2,770.00Genuine Mercury Gear Case 5.44 BASIC GRE, part number 8M0176878. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0159705.8M0176878- SKU:
- 8M0176878
- Availability:
- Usually Ships within 24hours
- Weight:
- 560.00 Ounces
MSRP: $2,770.00Now: $2,444.40Was: $2,770.00 -
On Sale
Mercury Gear Case 5.44 BAS CMBCW OEM 8M0176881
Mercury
MSRP: $2,770.00Now: $2,444.40Was: $2,770.00Genuine Mercury Gear Case 5.44 BAS CMBCW, part number 8M0176881. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0159708.8M0176881- SKU:
- 8M0176881
- Availability:
- Usually Ships within 24hours
- Weight:
- 560.00 Ounces
MSRP: $2,770.00Now: $2,444.40Was: $2,770.00 -
On Sale
Mercury Gear Case 5.44 BAS CMBCS OEM 8M0176882
Mercury
MSRP: $2,770.00Now: $2,444.40Was: $2,770.00Genuine Mercury Gear Case 5.44 BAS CMBCS, part number 8M0176882. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0159709.8M0176882- SKU:
- 8M0176882
- Availability:
- Usually Ships within 24hours
- Weight:
- 576.00 Ounces
MSRP: $2,770.00Now: $2,444.40Was: $2,770.00 -
On Sale
Mercury Gear Case 5.44 BAS CMB S OEM 8M0176880
Mercury
MSRP: $2,770.00Now: $2,444.40Was: $2,770.00Genuine Mercury Gear Case 5.44 BAS CMB S, part number 8M0176880. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0159707.8M0176880- SKU:
- 8M0176880
- Availability:
- Usually Ships within 24hours
- Weight:
- 544.00 Ounces
MSRP: $2,770.00Now: $2,444.40Was: $2,770.00 -
On Sale
Mercury Gear Case BASIC-CTR OEM 8M0228004
Mercury
MSRP: $2,759.49Now: $2,433.75Was: $2,759.49Genuine Mercury Gear Case BASIC-CTR, part number 8M0228004. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0200101.8M0228004- SKU:
- 8M0228004
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $2,759.49Now: $2,433.75Was: $2,759.49 -
On Sale
Mercury Gear Case BASIC STD OEM 8M0228003
Mercury
MSRP: $2,759.49Now: $2,433.75Was: $2,759.49Genuine Mercury Gear Case BASIC STD, part number 8M0228003. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8M0200100.8M0228003- SKU:
- 8M0228003
- Availability:
- Usually Ships within 24hours
- Weight:
- 624.00 Ounces
MSRP: $2,759.49Now: $2,433.75Was: $2,759.49 -
On Sale
Mercury GEAR HOUSING-FM OEM 859399T24
Mercury
MSRP: $2,730.00Now: $2,406.60Was: $2,730.00Genuine Mercury GEAR HOUSING-FM, part number 859399T24. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 849107A3, 849107A6, 849107A9, 849107T3, 849107T6,...859399T24- SKU:
- 859399T24
- Availability:
- Usually Ships within 24hours
- Weight:
- 412.50 Ounces
MSRP: $2,730.00Now: $2,406.60Was: $2,730.00 -
On Sale
Mercury GEAR HOUSING-TM OEM 840470T5
Mercury
MSRP: $2,695.00Now: $2,375.10Was: $2,695.00Genuine Mercury GEAR HOUSING-TM, part number 840470T5. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 840470A5, 849012A11, 849012A3, 849012A9, 849012T11,...840470T5- SKU:
- 840470T5
- Availability:
- Usually Ships within 24hours
- Weight:
- 444.00 Ounces
MSRP: $2,695.00Now: $2,375.10Was: $2,695.00 -
On Sale
Mercury 150 HP SeaPro Basic Gearcase Housing 8M0190046
Mercury
MSRP: $2,642.99Now: $2,330.94Was: $2,642.99Mercury Basic Gearcase Housing 8M0190046 is a genuine Mercury OEM replacement gearcase housing for select 150 HP EFI SeaPro FourStroke outboards. It serves as the main housing for the internal gears,...8M0190046- SKU:
- 8M0190046
- Availability:
- Usually Ships within 24hours
- Weight:
- 528.00 Ounces
MSRP: $2,642.99Now: $2,330.94Was: $2,642.99 -
On Sale
Mercury 150 HP Pro XS Basic Gearcase Housing 8M0228058
Mercury
MSRP: $2,547.99Now: $2,247.34Was: $2,547.99Mercury Basic Gearcase Housing 8M0228058 is a genuine Mercury OEM replacement gearcase housing used on select 150 HP EFI Pro XS FourStroke outboards. It forms the main housing for the gears,...8M0228058- SKU:
- 8M0228058
- Availability:
- Usually Ships within 24hours
- Weight:
- 464.00 Ounces
MSRP: $2,547.99Now: $2,247.34Was: $2,547.99 -
On Sale
Mercury DRIVESHAFT ASSY OEM 8M0231568
Mercury
MSRP: $2,488.99Now: $2,194.98Was: $2,488.99Genuine Mercury DRIVESHAFT ASSY, part number 8M0231568. Designed for use with compatible applications.8M0231568- SKU:
- 8M0231568
- Availability:
- Usually Ships within 24hours
- Weight:
- 217.12 Ounces
MSRP: $2,488.99Now: $2,194.98Was: $2,488.99 -
On Sale
Mercury Gear Case 25/30 4S XL OEM 8M0157393
Mercury
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15Genuine Mercury Gear Case 25/30 4S XL, part number 8M0157393. Designed for use with compatible applications.8M0157393- SKU:
- 8M0157393
- Availability:
- Usually Ships within 24hours
- Weight:
- 400.00 Ounces
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15 -
On Sale
Mercury Gear Case 25/30 2S LG OEM 8M0070908
Mercury
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15Genuine Mercury Gear Case 25/30 2S LG, part number 8M0070908. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 825132A28, 825132A8, 825132T28, 825132T38,...8M0070908- SKU:
- 8M0070908
- Availability:
- Usually Ships within 24hours
- Weight:
- 385.60 Ounces
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15 -
On Sale
Mercury Gear Case 25/30 2S SH OEM 8M0070907
Mercury
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15Genuine Mercury Gear Case 25/30 2S SH, part number 8M0070907. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 825132A6, 825132T06, 825132T37, 8M0057250.8M0070907- SKU:
- 8M0070907
- Availability:
- Usually Ships within 24hours
- Weight:
- 368.00 Ounces
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15 -
On Sale
Mercury Gear Case 25/30 4S LG OEM 8M0070900
Mercury
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15Genuine Mercury Gear Case 25/30 4S LG, part number 8M0070900. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 825132T23, 825132T36, 895154A05, 8M0045826.8M0070900- SKU:
- 8M0070900
- Availability:
- Usually Ships within 24hours
- Weight:
- 384.00 Ounces
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15 -
On Sale
Mercury Gear Case 25/30 4S SH OEM 8M0070899
Mercury
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15Genuine Mercury Gear Case 25/30 4S SH, part number 8M0070899. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 825132T22, 825132T35, 8M0057248.8M0070899- SKU:
- 8M0070899
- Availability:
- Usually Ships within 24hours
- Weight:
- 368.00 Ounces
MSRP: $2,357.15Now: $2,079.00Was: $2,357.15 -
On Sale
Mercury MOTOR LOWER UNIT OEM 8M0204463
Mercury
MSRP: $2,216.99Now: $1,954.86Was: $2,216.99Genuine Mercury MOTOR LOWER UNIT, part number 8M0204463. Designed for use with compatible applications.8M0204463- SKU:
- 8M0204463
- Availability:
- Usually Ships within 24hours
- Weight:
- 184.16 Ounces
MSRP: $2,216.99Now: $1,954.86Was: $2,216.99 -
On Sale
Mercury Gear Case 9.9-15-18 2S L OEM 8M0070904
Mercury
MSRP: $2,192.85Now: $1,934.10Was: $2,192.85Genuine Mercury Gear Case 9.9-15-18 2S L, part number 8M0070904. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 803729A2.8M0070904- SKU:
- 8M0070904
- Availability:
- Usually Ships within 24hours
- Weight:
- 294.40 Ounces
MSRP: $2,192.85Now: $1,934.10Was: $2,192.85 -
On Sale
Mercury Tiller Handle Kit for 65 Jet, 75 & 90HP 2-Stroke Outboards 12022A40
Mercury
MSRP: $2,134.49Now: $1,882.38Was: $2,134.49Mercury Tiller Handle Kit 12022A40 is a genuine Mercury OEM black tiller handle kit designed for select 65 Jet, 75HP, and 90HP 3-cylinder 2-stroke outboards. It can be used to convert compatible...12022A40- SKU:
- 12022A40
- Availability:
- Usually Ships within 24hours
- Weight:
- 224.00 Ounces
MSRP: $2,134.49Now: $1,882.38Was: $2,134.49 -
On Sale
Mercury Command Thrust Basic Gearcase Housing 8M0227984
Mercury
MSRP: $2,075.49Now: $1,830.40Was: $2,075.49Mercury Command Thrust Basic Gearcase Housing 8M0227984 is a genuine Mercury OEM replacement housing for select Command Thrust (CT) gearcase applications. It forms the main housing for the gears,...8M0227984- SKU:
- 8M0227984
- Availability:
- Usually Ships within 24hours
- Weight:
- 448.00 Ounces
MSRP: $2,075.49Now: $1,830.40Was: $2,075.49
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