Sold out -17% sale
Sierra Oversized - Not Qualified for Free Shipping Sierra Gear Housing Assy #18-4830
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Sierra Sierra Gear Housing Assy #18-4830 $1,147.16 $1,376.60
Sierra 18-4830 HousingsGear Housing AssyOEM Interchange:MERCURY MARINE: 1667-9011G59Sierra Gear Housing Assy #18-4830Normalized SKU: 184830UPC Code: 808282203009
Sold out -14% sale
Sierra Upper Gear Housing Complete #18-4806
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Sierra Sierra Upper Gear Housing Complete #18-4806 $1,719.99 $1,995.19
Sierra 18-4806 HousingsUpper Gear Housing CompleteOEM Interchange:OMC: 984765OMC: 986380Sierra Upper Gear Housing Complete #18-4806Normalized SKU: 184806UPC Code: 808282228460
Sold out -20% sale
Sierra Oversized - Not Qualified for Free Shipping Sierra Upper Gear Housing Complete #18-4805
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Sierra Sierra Upper Gear Housing Complete #18-4805 $524.42 $654.54
Sierra 18-4805 HousingsUpper Gear Housing CompleteOEM Interchange:OMC: 984771OMC: 986382Sierra Upper Gear Housing Complete #18-4805Normalized SKU: 184805UPC Code: 808282228453
Sold out -20% sale
Sierra Oversized - Not Qualified for Free Shipping Sierra Upper Gear Housing Complete #18-4804
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Sierra Sierra Upper Gear Housing Complete #18-4804 $513.30 $640.66
Sierra 18-4804 HousingsUpper Gear Housing CompleteOEM Interchange:OMC: 984770OMC: 986381Sierra Upper Gear Housing Complete #18-4804Normalized SKU: 184804UPC Code: 808282228446
Sold out -17% sale
Sierra Oversized - Not Qualified for Free Shipping Sierra Lower Unit Housing #18-2415
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Sierra Sierra Lower Unit Housing #18-2415 $1,118.93 $1,342.71
Sierra 18-2415 HousingsLower Unit HousingOEM Interchange:MERCURY MARINE: 1623-815822A36Sierra Lower Unit Housing #18-2415Normalized SKU: 182415UPC Code: 808282180874
Sold out -18% sale
Sierra Oversized - Not Qualified for Free Shipping Sierra Upper Unit Housing #18-2411
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Sierra Sierra Upper Unit Housing #18-2411 $725.75 $878.83
Sierra 18-2411 HousingsUpper Unit HousingOEM Interchange:MERCURY MARINE: 1547-861063A4Sierra Upper Unit Housing #18-2411Normalized SKU: 182411UPC Code: 808282180881
Sold out -20% sale
Sierra Lower Gear Housing #18-2402
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Sierra Sierra Lower Gear Housing #18-2402 $610.47 $761.94
Sierra 18-2402 HousingsLower Gear HousingOEM Interchange:MERCURY MARINE: 1623-5356A4Sierra Lower Gear Housing #18-2402Normalized SKU: 182402UPC Code: 030999997142
Sold out -18% sale
Sierra Lower Gear Housing #18-2401
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Sierra Sierra Lower Gear Housing #18-2401 $957.73 $1,159.76
Sierra 18-2401 Housings Features: Includes tapered roller bearing for non-tractor 14/28 or 17/28 gears Additional Details: Bore Size: 3.2635-3.2650 For: MR/Alpha style Lower Gear Housing OEM Interchange: GLM 18000 Mallory 9-79127 Mercruiser Stern Drive 1623-8951A15 1623-8951A27 1623-8951A37 1623-8951A5 Sierra Lower Gear Housing #18-2401 Normalized SKU: 182401UPC Code: 030999997135

Frequently Asked Questions

First Choice Marine is an online marine retailer carrying a diverse line of marine parts and accessories and related items from industry-respected and demanded manufacturers and suppliers. Through our diverse distributor network, we are able to access over 150,000 items, including our current site inventory, new products being added, and special order items. If you need it on your boat... we are your one-stop shop!

Yes, we offer FREE Shipping on most orders over $149 to US-48*.

Each product displays a shipping status message, just above the item price. Below is the meaning for each of these codes.

  • Qualifies for Free Shipping: This item qualifies for free shipping when the order is $149+
  • Qualifies for Free Ground Shipping: This item qualifies for free ground shipping when the order is $149+.
  • Oversized - Not Qualified for Free Shipping: This item is too large/heavy to qualify for free shipping
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  • In-Store Pickup Only: This item can only be picked up in our Grain Valley, MO retail store

Below the price of the item, on the product page, there is a message indicating the availability of the product.

The quantity on hand is updated as inventory events happen and matches what we have available. If you have urgent needs and we are close to what you need, contact us, and we can confirm stock.

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If you need to return an item, please follow the guidelines here so we can process a prompt refund and assist you in finding the correct item.

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