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.
- Product
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- Price
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On Sale
Mercury Zeus 1.478 Ratio Complete Gearcase Assembly 879345T44
Mercury
MSRP: $24,607.15Now: $21,703.50Was: $24,607.15Mercury Zeus Complete Gearcase Assembly 879345T44 is a genuine Mercury Marine OEM replacement gearcase for select MerCruiser Zeus pod drive systems. Mercury's current service-parts information...879345T44- SKU:
- 879345T44
- Availability:
- Usually Ships within 24hours
- Weight:
- 3,344.00 Ounces
MSRP: $24,607.15Now: $21,703.50Was: $24,607.15Qty in Cart: 0Quantity:Price:MSRP: $24,607.15Now: $21,703.50Was: $24,607.15Subtotal: -
On Sale
Mercury Zeus Zorro 1.611 Ratio Complete Gearcase Assembly 879345T43
Mercury
MSRP: $24,607.15Now: $21,703.50Was: $24,607.15Mercury Zeus Zorro Complete Gearcase Assembly 879345T43 is a genuine Mercury Marine OEM replacement gearcase for select MerCruiser Zeus pod drive systems. This Zorro gearcase uses a 1.611879345T43- SKU:
- 879345T43
- Availability:
- Usually Ships within 24hours
- Weight:
- 3,344.00 Ounces
MSRP: $24,607.15Now: $21,703.50Was: $24,607.15Qty in Cart: 0Quantity:Price:MSRP: $24,607.15Now: $21,703.50Was: $24,607.15Subtotal: -
On Sale
Mercury 500-600 HP V12 Silver Contra-Rotating Complete Gearcase 8M0174564
Mercury
MSRP: $24,007.15Now: $21,174.30Was: $24,007.15Mercury Silver Contra-Rotating Complete Gearcase 8M0174564 is a genuine Mercury OEM replacement gearcase assembly for select 7.6L V12 outboards. Mercury parts breakdowns identify 8M0174564 as the...8M0174564- SKU:
- 8M0174564
- Availability:
- Usually Ships within 24hours
- Weight:
- 2,208.00 Ounces
MSRP: $24,007.15Now: $21,174.30Was: $24,007.15Qty in Cart: 0Quantity:Price:MSRP: $24,007.15Now: $21,174.30Was: $24,007.15Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Counter-Rotation XXX-Long Complete Gearcase (White) 8M0224417
Mercury
MSRP: $23,365.00Now: $20,601.00Was: $23,365.00Mercury Racing Complete Gearcase 8M0224417 is a genuine Mercury OEM replacement gearcase assembly for select 500R 4.6L V8 Racing outboards. It is the counter-rotation, XXX-Long configurat8M0224417- SKU:
- 8M0224417
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $23,365.00Now: $20,601.00Was: $23,365.00Qty in Cart: 0Quantity:Price:MSRP: $23,365.00Now: $20,601.00Was: $23,365.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 XXX-Long Complete Gearcase (White) 8M0224416
Mercury
MSRP: $23,365.00Now: $20,601.00Was: $23,365.00Mercury Racing 500R 1.60:1 XXX-Long Complete Gearcase 8M0224416 is a genuine Mercury OEM gearcase assembly for select Mercury Racing 500R applications. Mercury parts listings identify 8M0224416 as...8M0224416- SKU:
- 8M0224416
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $23,365.00Now: $20,601.00Was: $23,365.00Qty in Cart: 0Quantity:Price:MSRP: $23,365.00Now: $20,601.00Was: $23,365.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Counter-Rotation XX-Long Complete Gearcase (White) 8M0224415
Mercury
MSRP: $23,150.00Now: $20,412.00Was: $23,150.00Mercury Racing 500R 1.60:1 Counter-Rotation XX-Long Complete Gearcase 8M0224415 is a genuine Mercury OEM gearcase assembly for select Mercury Racing 500R applications. The factory designation GC-500R...8M0224415- SKU:
- 8M0224415
- Availability:
- Usually Ships within 24hours
- Weight:
- 1,528.00 Ounces
MSRP: $23,150.00Now: $20,412.00Was: $23,150.00Qty in Cart: 0Quantity:Price:MSRP: $23,150.00Now: $20,412.00Was: $23,150.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 XX-Long Complete Gearcase (White) 8M0224414
Mercury
MSRP: $23,150.00Now: $20,412.00Was: $23,150.00Mercury Racing 500R 1.60:1 XX-Long Complete Gearcase 8M0224414 is a genuine Mercury OEM gearcase assembly for select Mercury Racing 500R applications. It is the standard-rotation, XX-Long...8M0224414- SKU:
- 8M0224414
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $23,150.00Now: $20,412.00Was: $23,150.00Qty in Cart: 0Quantity:Price:MSRP: $23,150.00Now: $20,412.00Was: $23,150.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Counter-Rotation X-Long Complete Gearcase (White) 8M0224413
Mercury
MSRP: $23,080.00Now: $20,349.00Was: $23,080.00Mercury Racing 500R 1.60:1 Counter-Rotation X-Long Complete Gearcase 8M0224413 is a genuine Mercury OEM gearcase assembly for select Mercury Racing 500R applications. Mercury parts listings identify...8M0224413- SKU:
- 8M0224413
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $23,080.00Now: $20,349.00Was: $23,080.00Qty in Cart: 0Quantity:Price:MSRP: $23,080.00Now: $20,349.00Was: $23,080.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 X-Long Complete Gearcase (White) 8M0224412
Mercury
MSRP: $23,080.00Now: $20,349.00Was: $23,080.00Mercury Racing 500R 1.60:1 X-Long Complete Gearcase 8M0224412 is a genuine Mercury OEM gearcase assembly for select Mercury Racing 500R applications. It is the standard-rotation, X-Long configuration...8M0224412- SKU:
- 8M0224412
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $23,080.00Now: $20,349.00Was: $23,080.00Qty in Cart: 0Quantity:Price:MSRP: $23,080.00Now: $20,349.00Was: $23,080.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Counter-Rotation Long Complete Gearcase (White) 8M0224411
Mercury
MSRP: $22,935.00Now: $20,223.00Was: $22,935.00Mercury Racing 500R 1.60:1 Counter-Rotation Long Complete Gearcase 8M0224411 is a genuine Mercury OEM complete gearcase assembly for select Mercury Racing 500R applications. It is the...8M0224411- SKU:
- 8M0224411
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,935.00Now: $20,223.00Was: $22,935.00Qty in Cart: 0Quantity:Price:MSRP: $22,935.00Now: $20,223.00Was: $22,935.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Long Complete Gearcase (White) 8M0224409
Mercury
MSRP: $22,935.00Now: $20,223.00Was: $22,935.00Mercury Racing 500R 1.60:1 Long Complete Gearcase 8M0224409 is a genuine Mercury OEM complete gearcase assembly for select Mercury Racing 500R applications. It is the standard-rotation, Long...8M0224409- SKU:
- 8M0224409
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,935.00Now: $20,223.00Was: $22,935.00Qty in Cart: 0Quantity:Price:MSRP: $22,935.00Now: $20,223.00Was: $22,935.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Counter-Rotation XXX-Long Complete Gearcase (Graphite Gray) 8M0224408
Mercury
MSRP: $22,795.00Now: $20,097.00Was: $22,795.00Mercury Racing 500R 1.60:1 Counter-Rotation XXX-Long Complete Gearcase 8M0224408 is a genuine Mercury OEM gearcase assembly for select Mercury Racing 500R applications. This configuration is finished...8M0224408- SKU:
- 8M0224408
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,795.00Now: $20,097.00Was: $22,795.00Qty in Cart: 0Quantity:Price:MSRP: $22,795.00Now: $20,097.00Was: $22,795.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 XXX-Long Complete Gearcase (Graphite Gray) 8M0224407
Mercury
MSRP: $22,795.00Now: $20,097.00Was: $22,795.00Mercury Racing 500R 1.60:1 XXX-Long Complete Gearcase 8M0224407 is a genuine Mercury OEM gearcase assembly for select Mercury Racing 500R applications. It is the standard-rotation, XXX-Long...8M0224407- SKU:
- 8M0224407
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,795.00Now: $20,097.00Was: $22,795.00Qty in Cart: 0Quantity:Price:MSRP: $22,795.00Now: $20,097.00Was: $22,795.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Counter-Rotation XX-Long Complete Gearcase (Graphite Gray) 8M0236227
Mercury
MSRP: $22,580.00Now: $19,908.00Was: $22,580.00Mercury Racing 500R 1.60:1 Counter-Rotation XX-Long Complete Gearcase 8M0236227 is a genuine Mercury OEM gearcase assembly for select Mercury Racing 500R applications. The factory designation GC-500R...8M0236227- SKU:
- 8M0236227
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,580.00Now: $19,908.00Was: $22,580.00Qty in Cart: 0Quantity:Price:MSRP: $22,580.00Now: $19,908.00Was: $22,580.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 XX-Long Complete Gearcase (Graphite Gray) 8M0236226
Mercury
MSRP: $22,580.00Now: $19,908.00Was: $22,580.00Mercury Racing 500R 1.60:1 XX-Long Complete Gearcase 8M0236226 is a genuine Mercury OEM complete gearcase assembly for select Mercury Racing 500R applications. It is the standard-rotation, XX-Long...8M0236226- SKU:
- 8M0236226
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,580.00Now: $19,908.00Was: $22,580.00Qty in Cart: 0Quantity:Price:MSRP: $22,580.00Now: $19,908.00Was: $22,580.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Counter-Rotation X-Long Complete Gearcase (Graphite Gray) 8M0236225
Mercury
MSRP: $22,505.00Now: $19,845.00Was: $22,505.00Mercury Racing 500R 1.60:1 Counter-Rotation X-Long Complete Gearcase 8M0236225 is a genuine Mercury OEM complete gearcase assembly for select Mercury Racing 500R applications. The factory designation...8M0236225- SKU:
- 8M0236225
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,505.00Now: $19,845.00Was: $22,505.00Qty in Cart: 0Quantity:Price:MSRP: $22,505.00Now: $19,845.00Was: $22,505.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 X-Long Complete Gearcase (Graphite Gray) 8M0236224
Mercury
MSRP: $22,505.00Now: $19,845.00Was: $22,505.00Mercury Racing 500R 1.60:1 X-Long Complete Gearcase 8M0236224 is a genuine Mercury OEM complete gearcase assembly for select Mercury Racing 500R applications. The factory designation GC-500R G 1.60...8M0236224- SKU:
- 8M0236224
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,505.00Now: $19,845.00Was: $22,505.00Qty in Cart: 0Quantity:Price:MSRP: $22,505.00Now: $19,845.00Was: $22,505.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Counter-Rotation Long Complete Gearcase (Graphite Gray) 8M0224402
Mercury
MSRP: $22,365.00Now: $19,719.00Was: $22,365.00Mercury Racing 500R 1.60:1 Counter-Rotation Long Complete Gearcase 8M0224402 is a genuine Mercury OEM complete gearcase assembly for select Mercury Racing 500R applications. It is the...8M0224402- SKU:
- 8M0224402
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,365.00Now: $19,719.00Was: $22,365.00Qty in Cart: 0Quantity:Price:MSRP: $22,365.00Now: $19,719.00Was: $22,365.00Subtotal: -
On Sale
Mercury Racing 500R R-Drive 1.60:1 Long Complete Gearcase (Graphite Gray) 8M0224401
Mercury
MSRP: $22,365.00Now: $19,719.00Was: $22,365.00Mercury Racing Complete Gearcase 8M0224401 is a genuine OEM replacement gearcase for the Mercury Racing 500R 4.6L V8 with the R-Drive 1.60:1 gearcase. This configuration is standard rotation, Long...8M0224401- SKU:
- 8M0224401
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $22,365.00Now: $19,719.00Was: $22,365.00Qty in Cart: 0Quantity:Price:MSRP: $22,365.00Now: $19,719.00Was: $22,365.00Subtotal: -
On Sale
Mercury Racing 500R 1.60:1 Counter-Rotation XXX-Long Complete Gearcase (Graphite Gray) 8M0219810
Mercury
MSRP: $18,555.00Now: $16,361.10Was: $18,555.00Mercury Racing 500R 1.60:1 Counter-Rotation XXX-Long Complete Gearcase 8M0219810 is a genuine Mercury OEM gearcase assembly for select Mercury Racing 500R applications. It is the counter-rotation,...8M0219810- SKU:
- 8M0219810
- Availability:
- Usually Ships within 24hours
- Weight:
- 0.00 Ounces
MSRP: $18,555.00Now: $16,361.10Was: $18,555.00Qty in Cart: 0Quantity:Price:MSRP: $18,555.00Now: $16,361.10Was: $18,555.00Subtotal:
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