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Parts Selection Guide

Find the parts you need

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Prop Selection Guide

Find the right prop for your boat

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      Mercruiser Gearcase & Drive Parts

      • Sierra 18-2128 Center Socket Replaces 393831
        $110.49
        $77.49

        Sierra 18-2128 Mercruiser, OMC, and Volvo Center Socket Fits: IA/IB/IC & EZ, MC-I, R,MR, Alpha One Gen II (Serial No.OL949778 & below) Bravo (Serial No. OM111207 & below) MC II & TS All OMC Cobra Interchangeable...

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      • Sierra 18-3752 Retaining Nut Replaces 8168112
        $34.99
        $26.49

        Sierra 18-3752 Mercruiser Drive Shaft Housing Retaining Nut Sierra high-quality engine parts are designed to meet OEM specifications. For Mercruiser Stern Drives. Interchangeable with: GLM 28350 Mallory 9-72154 Mercruiser Stern...

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      • Sierra 18-0681 Washer
        $8.99
        $7.99

        Sierra 18-0681 Washer Sierra high-quality engine parts are designed to meet OEM specifications. Interchangeable with: Chrysler/Force/US Marine 12-934161 12-93416 GLM 30020 Mercruiser Stern Drive 12-32834 12-8M2001219 Mercury...

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      • Sterndrive Engineering Repl Lower Unit Mercruiser Bravo One
        $1,529.99
        $1,274.99

        Sterndrive Engineering Repl Lower Unit Mercruiser Bravo One It can be modified to back fit 1988 - 1991 90-121-02 has a side water pick up 90-122-02 has a side and low water pick up Item is subject to a 20% restocking fee (Boat Covers, Bimini...

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      • Mercury - Mercruiser 26-823894 Seal - Oil
        $29.39
        $24.49

        Mercury - Mercruiser 26-823894 Seal - Oil Genuine OEM Mercury - Mercruiser part. Application: Alpha One Gen II (1998 and up) - s/n #0L100040 & up Alpha One Gen II - (1991 - 1995) - s/n #0D469859 thru 0F679999 Alpha One Gen II - (1996 - 1997) -...

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      • Mercury - Mercruiser 8M0185784 Shift Linkage Kit
        $153.59
        $127.99

        Mercury - Mercruiser 8M0185784 Shift Linkage Kit Genuine OEM replacement part. Replacement shift linkage kit for Mercruiser Bravo high bump shift levers. Supersedes part # 861175A2 Fits: Bravo One, Bravo Two, Bravo Three s/n 0F730000 thru...

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      • Sierra 18-8217 Transom Seal Kit
        $292.49
        $204.99

        Sierra 18-8217 Transom Seal Kit Sealed Gimbal Bearing For: R, MR, Alpha I (1983-1990) w/exhaust tube s/n 6225577-0D469858 For: Alpha I SS (1986-1989) w/exhaust tube s/n 0A545004 & Up Interchangeable with: Mercruiser Stern...

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      • Sierra 18-2191 Carrier Bearing
        $127.49
        $89.49

        Sierra 18-2191 Mercruiser Carrier Bearing Sierra high-quality engine parts are designed to meet OEM specifications. For housings with casting #73020C. Fits MC-I, R, MR & Alpha One Interchangeable...

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      • Sierra 18-2617 Outdrive Gasket Set Replaces 27-35996A1
        $13.49
        $9.99

        Sierra 18-2617 Mercruiser Outdrive Gasket Set For Old Style Outdrives 1A/1B/1C And EZ Shift 1964-1966 Kit Includes: (1) 18-2556 Drive Shaft Housing To Bell Housing Gasket (1) 18-2840 Bell Housing Gasket (1) 18-7153 O-Ring (1) 18-7170...

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      • Sierra 18-3719 Pinion Nut Replaces 11-35921
        $4.99
        $3.99

        3/8" (18mm) Pinion Nut for Mercury, Mercruiser, OMC 3/8"-18mm Replaces: OMC - 0314730 Mallory - 9-78013 GLM - 11190 Pro Marine - 18-3719 Sterndrive Engineering - 98-102-37 Mercury 11-35921  

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      • Sierra 18-7157 O-Ring
        $4.99
        $3.49

        Sierra 18-7157 O-Ring I.D.: 3.500" or 88.9mm Width: 0.210" or 5.3mm Interchangeable with: GLM 83410 Mallory 9-76542 Mercruiser Stern Drive 25-29976 Mercury Marine 25-29976

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      • Sierra 18-7159 O-Ring
        $3.99
        $3.49

        Sierra 18-7159 O-Ring I.D.: 3.855" or 98mm Width: 0.210" or 5.3mm Interchangeable with: GLM 83440 Mallory 9-76544 Mercruiser Stern Drive 25-48451 25-31534 Mercury Marine 25-31534

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      • Sierra 18-2140 Engine Mount Bolt Kit
        $36.99
        $25.99

        Sierra 18-2140 Engine Mount Bolt Kit Sierra high-quality engine parts are designed to meet OEM specifications. For Mercruiser I engines. Kit Includes: (1) 18-0681 Washer (1) 18-3729 Motor Mount Bolt Interchangeable with: GLM 21811

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      Mercruiser OEM Engine Parts Finder

      Mercruiser Gearcase

      Shims, yokes, and spools may throw your head in a whirl. Just the idea of “gearcase” is an intimidating one, especially for newer boaters and those just taking on the do-it-yourself route. You’ve made a wise choice with your Mercruiser engine, but are now hoping to perform preventative maintenance or repair a busted part. Wholesale Marine has all that you need for your Mercruiser gearcase for pre-Alpha, Alpha, and Bravo drives.

      Where to Begin?

      Whether a pro boater or a casual weekend cruiser, your Mercruiser gearcase needs attention from time to time. The delicate intricacies of the gearcase are not to be taken lightly, and we recommend referring to your engine’s manual, manufacturer’s website, or a number of other resources as you diagnose or update your boat’s engine. Once you know what you are looking for, we strive to make it as easy as possible to locate it, beginning with our Parts Selection Guide. We offer a wide array of Mercruiser gearcase components. Both upper and lower gear housing seal kits are offered, each one meeting OEM standards and including all that you need. Upper unit gears, shift spools, replacement drives, shims, O-rings, and seals make this an excellent comprehensive site for all of your Mercruiser gearcase needs.

      Whether an engine expert or a newer novice, we want to assist you in your Mercruiser gearcase journey. We have a highly-trained team full of experienced boaters who have been in your shoes and can help you choose the right part from the get-go. We are here Monday through Friday, 9:00 AM to 6:00 PM EST, at (877) 388-2628 to help you narrow down your search and select just the right part for the job. Our Captain’s Club loyalty rewards program, shipping perks, and price match guarantee are added bonuses to ensure each and every customers’ satisfaction