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 9.9-18 2S SH OEM 8M0070903
Mercury
MSRP: $1,500.00Now: $1,323.00Was: $1,500.00Genuine Mercury Gear Case 9.9-18 2S SH, part number 8M0070903. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 803729A1.8M0070903- SKU:
- 8M0070903
- Availability:
- Usually Ships within 24hours
- Weight:
- 283.20 Ounces
MSRP: $1,500.00Now: $1,323.00Was: $1,500.00 -
On Sale
Mercury Gear Case 15 4S-S-BLK OEM 8833T33
Mercury
MSRP: $1,500.00Now: $1,323.00Was: $1,500.00Genuine Mercury Gear Case 15 4S-S-BLK, part number 8833T33. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8833A33.8833T33- SKU:
- 8833T33
- Availability:
- Usually Ships within 24hours
- Weight:
- 203.20 Ounces
MSRP: $1,500.00Now: $1,323.00Was: $1,500.00 -
On Sale
Mercury Gear Case-10/15 B 2.00 L OEM 8833T15
Mercury
MSRP: $1,500.00Now: $1,323.00Was: $1,500.00Genuine Mercury Gear Case-10/15 B 2.00 L, part number 8833T15. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8833A10, 8833A15, 8833A3, 8833A8.8833T15- SKU:
- 8833T15
- Availability:
- Usually Ships within 24hours
- Weight:
- 272.00 Ounces
MSRP: $1,500.00Now: $1,323.00Was: $1,500.00 -
On Sale
Mercury Gear Case-10/15 B 2.00 OEM 8833T13
Mercury
MSRP: $1,500.00Now: $1,323.00Was: $1,500.00Genuine Mercury Gear Case-10/15 B 2.00, part number 8833T13. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 8833A13, 8833A2, 8833A7, 8833A9.8833T13- SKU:
- 8833T13
- Availability:
- Usually Ships within 24hours
- Weight:
- 243.20 Ounces
MSRP: $1,500.00Now: $1,323.00Was: $1,500.00 -
On Sale
Mercury Gear Case 6-9.8 2S SH OEM 8M0172380
Mercury
MSRP: $1,421.45Now: $1,253.70Was: $1,421.45Genuine Mercury Gear Case 6-9.8 2S SH, part number 8M0172380. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 803729A5, 803729T11, 8M0070901.8M0172380- SKU:
- 8M0172380
- Availability:
- Usually Ships within 24hours
- Weight:
- 208.00 Ounces
MSRP: $1,421.45Now: $1,253.70Was: $1,421.45 -
On Sale
Mercury 135-150 HP Silver Basic Gearcase Housing 8M0231097
Mercury
MSRP: $1,385.99Now: $1,222.14Was: $1,385.99Mercury Basic Gearcase Housing 8M0231097 is a genuine Mercury OEM replacement gear housing for select 135-150 HP EFI FourStroke outboards. This version features a silver finish a8M0231097- SKU:
- 8M0231097
- Availability:
- Usually Ships within 24hours
- Weight:
- 448.00 Ounces
MSRP: $1,385.99Now: $1,222.14Was: $1,385.99 -
On Sale
Mercury Gear Case UL 9.9/15 OEM 8M0158696
Mercury
MSRP: $1,257.15Now: $1,108.80Was: $1,257.15Genuine Mercury Gear Case UL 9.9/15, part number 8M0158696. Designed for use with compatible applications.8M0158696- SKU:
- 8M0158696
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $1,257.15Now: $1,108.80Was: $1,257.15 -
On Sale
Mercury Gear Case HSG COMP INT L OEM 8M0075064
Mercury
MSRP: $1,257.15Now: $1,108.80Was: $1,257.15Genuine Mercury Gear Case HSG COMP INT L, part number 8M0075064. Designed for use with compatible applications.8M0075064- SKU:
- 8M0075064
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $1,257.15Now: $1,108.80Was: $1,257.15 -
On Sale
Mercury Gear Case BASIC 40 2S OEM 8M0127360
Mercury
MSRP: $1,188.99Now: $1,048.32Was: $1,188.99Genuine Mercury Gear Case BASIC 40 2S, part number 8M0127360. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 825132A10, 8M0084545.8M0127360- SKU:
- 8M0127360
- Availability:
- Usually Ships within 24hours
- Weight:
- 224.00 Ounces
MSRP: $1,188.99Now: $1,048.32Was: $1,188.99 -
On Sale
Mercury DRIVESHAFT HOUSING ASSY-NON COMPLETED-JET OEM 852421T09
Mercury
MSRP: $1,174.49Now: $1,035.91Was: $1,174.49Genuine Mercury DRIVESHAFT HOUSING ASSY-NON COMPLETED-JET, part number 852421T09. Designed for use with compatible applications.852421T09- SKU:
- 852421T09
- Availability:
- Usually Ships within 24hours
- Weight:
- 294.40 Ounces
MSRP: $1,174.49Now: $1,035.91Was: $1,174.49 -
On Sale
Mercury Gear Case 8/9.9 4S UL OEM 8M0135933
Mercury
MSRP: $1,121.45Now: $989.10Was: $1,121.45Genuine Mercury Gear Case 8/9.9 4S UL, part number 8M0135933. Designed for use with compatible applications.8M0135933- SKU:
- 8M0135933
- Availability:
- Usually Ships within 24hours
- Weight:
- 272.00 Ounces
MSRP: $1,121.45Now: $989.10Was: $1,121.45 -
On Sale
Mercury Gear Case 8/9.9 4S XL OEM 8M0070895
Mercury
MSRP: $1,121.45Now: $989.10Was: $1,121.45Genuine Mercury Gear Case 8/9.9 4S XL, part number 8M0070895. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 895154T08, 895154T10, 895154T14.8M0070895- SKU:
- 8M0070895
- Availability:
- Usually Ships within 24hours
- Weight:
- 336.00 Ounces
MSRP: $1,121.45Now: $989.10Was: $1,121.45 -
On Sale
Mercury 5-Inch Black Conversion Kit 12092A13
Mercury
MSRP: $1,120.99Now: $988.47Was: $1,120.99The Mercury Conversion Kit (5-Inch Black) 12092A13 is a genuine Mercury OEM conversion kit designed for select Mercury and MerCruiser applications. This conversion kit includes the components...12092A13- SKU:
- 12092A13
- Availability:
- Usually Ships within 24hours
- Weight:
- 374.00 Ounces
MSRP: $1,120.99Now: $988.47Was: $1,120.99 -
On Sale
Mercury DRIVESHAFT ASSY OEM 8M0218215
Mercury
MSRP: $1,074.99Now: $947.77Was: $1,074.99Genuine Mercury DRIVESHAFT ASSY, part number 8M0218215. Designed for use with compatible applications.8M0218215- SKU:
- 8M0218215
- Availability:
- Usually Ships within 24hours
- Weight:
- 104.70 Ounces
MSRP: $1,074.99Now: $947.77Was: $1,074.99 -
On Sale
Mercury GEARCASE TOOL KIT OEM 8M0130705
Mercury
MSRP: $1,030.99Now: $876.34Was: $1,030.99Genuine Mercury GEARCASE TOOL KIT, part number 8M0130705. Designed for use with compatible applications.8M0130705- SKU:
- 8M0130705
- Availability:
- Usually Ships within 24hours
- Weight:
- 121.50 Ounces
MSRP: $1,030.99Now: $876.34Was: $1,030.99 -
On Sale
Mercury Gear Case 8/9.9 4S LONG OEM 8M0229976
Mercury
MSRP: $964.49Now: $850.50Was: $964.49Genuine Mercury Gear Case 8/9.9 4S LONG, part number 8M0229976. Designed for use with compatible applications.8M0229976- SKU:
- 8M0229976
- Availability:
- Usually Ships within 24hours
- Weight:
- 256.00 Ounces
MSRP: $964.49Now: $850.50Was: $964.49 -
On Sale
Mercury Gear Case 8/9.9 4S SHORT OEM 8M0229974
Mercury
MSRP: $964.49Now: $850.50Was: $964.49Genuine Mercury Gear Case 8/9.9 4S SHORT, part number 8M0229974. Designed for use with compatible applications.8M0229974- SKU:
- 8M0229974
- Availability:
- Usually Ships within 24hours
- Weight:
- 240.00 Ounces
MSRP: $964.49Now: $850.50Was: $964.49 -
On Sale
Mercury Gear Case 8/9.9 4S LONG OEM 8M0158633
Mercury
MSRP: $964.30Now: $850.50Was: $964.30Genuine Mercury Gear Case 8/9.9 4S LONG, part number 8M0158633. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 895154T03, 895154T11, 8M0070883, 8M0135931.8M0158633- SKU:
- 8M0158633
- Availability:
- Usually Ships within 24hours
- Weight:
- 240.00 Ounces
MSRP: $964.30Now: $850.50Was: $964.30 -
On Sale
Mercury Gear Case 8/9.9 4S SHORT OEM 8M0158631
Mercury
MSRP: $964.30Now: $850.50Was: $964.30Genuine Mercury Gear Case 8/9.9 4S SHORT, part number 8M0158631. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 895154T02, 895154T12, 8M0070881, 8M0135929.8M0158631- SKU:
- 8M0158631
- Availability:
- Usually Ships within 24hours
- Weight:
- 240.00 Ounces
MSRP: $964.30Now: $850.50Was: $964.30 -
On Sale
Mercury Gear Case 8/9.9 4S LG OEM 8M0070884
Mercury
MSRP: $964.30Now: $850.50Was: $964.30Genuine Mercury Gear Case 8/9.9 4S LG, part number 8M0070884. Designed for use with compatible applications. Replaces / supersedes Mercury part numbers: 895154T07, 895154T09, 895154T13.8M0070884- SKU:
- 8M0070884
- Availability:
- Usually Ships within 24hours
- Weight:
- 320.00 Ounces
MSRP: $964.30Now: $850.50Was: $964.30
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