Mercruiser Gearcase & Drive Parts

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Parts Selection Guide

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Prop Selection Guide

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      • Sierra 18-1150 Needle Roller Bearing
        $70.99
        $49.49

        Sierra 18-1150 Mercruiser Needle Roller Bearing Sierra high-quality engine parts are designed to meet OEM specifications. Fits MC-I & R drives Interchangeable with: GLM 21600 Mercruiser Stern...

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      • Sierra 18-2296 Mercruiser Shim
        $7.99
        $5.49

        Sierra 18-2296 Mercruiser Shim Sierra replacement shim for Mercruiser Stern Drives. Size: .055 Interchangeable with: GLM 28380 Mercruiser Stern Drive 15-45811 15-71013 23-8M0124132

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      • CLEARANCE
        Sierra 18-2407 Gear Set
        $535.49
        $358.99

        Sierra 18-2407 Gear Set for Mercruiser MR/Alpha/Gen 2 Lower Gear Housings Sierra replacement gear set for MR/Alpha One/Gen II engines. Set Contains: (1) 18-1117 Pinion Bearing (1) 18-1143 Tapered Roller Bearing (1) 18-1155 Ball Bearing (1)...

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      • 18-2516
        $1.99
        $1.49

        Sierra 18-2516 Bravo Outdrive Seal Sierra high-quality engine parts are designed to meet OEM specifications. Fits Mercruiser Bravo drives. Interchangeable with: GLM 86310 Mallory 9-76503 Mercruiser Stern...

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      • Sierra 18-7160-9 O-Ring (Priced Per Pkg Of 5)
        $15.49
        $10.99

        Sierra 18-7160-9 O-Ring (Pkg Of 5) Sierra replacement O-ring for Mercury and Mercruiser engines. I.D.: 2.635" or 67mm Width: 0.210" or 5.3mm Package of 5 Interchangeable with: GLM 83340 Mallory 9-76545 Mercruiser Stern...

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      • Sierra 18-7161-9 O-Ring (Pkg Of 5)
        $15.49
        $11.99

        Sierra 18-7161-9 O-Ring (Pkg Of 5) Sierra replacement O-ring for Mercruiser and Mercury engines. I.D.: 3.250" or 82.6mm Width: 0.070" or 1.8mm Package of 5 Interchangeable with: GLM 80420 Mallory 9-76546 Mercruiser Stern...

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      • Sierra Retainer Seal Kit 18-2469
        $103.99
        $77.99

        Sierra Retainer Seal Kit 18-2469 This Sierra Retainer Seal Kit has Sierra's guaranteed fitment, backed by their lifetime warranty. It has a direct application fitment that exceeds OEM quality.  Interchangeable with: Mercruiser Stern...

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      • Mercruiser 43-18411A-2 Upper Gear Set - 1.50:1
        $727.99
        $633.49

        Mercruiser 43-18411A-2 Upper Gear Set - 1.50:1 Genuine OEM Mercury-Mercruiser part. Fits: MC‑I, R, MR, Alpha One & Gen II (s/n 0K999999 and below) (1971‑1997) 22-20 Teeth 1.50/1.47 Ratio Special Order Item.

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      • Mercruiser 43-18411A-4 Upper Gear Set
        $1,094.99
        $952.49

        Mercruiser 43-18411A-4 Upper Gear Set Genuine OEM Mercury-Mercruiser part. For use w/ heavy duty 1.50 gears only. The HD 1.50 drive gear has a stepped bearing surface requiring the use of a special bearing kit having 2 different I.D...

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      • Mercruiser 43-45814A-5 Upper Gear Set - 1.65:1
        $550.99
        $479.49

        Mercruiser 43-45814A-5 Upper Gear Set - 1.65:1 Genuine OEM Mercury-Mercruiser part. Fits: MC‑I, R, MR, Alpha One & Gen II (s/n 0K999999 and below) (1970‑1997) 24-24 Teeth 1.65/1.62 Ratio Special Order Item.

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      • Mercruiser 43-55778A-3 Upper Gear Set - 1.98:1
        $582.99
        $506.99

        Mercruiser 43-55778A-3 Upper Gear Set - 1.98:1 Genuine OEM Mercury-Mercruiser part. Fits: MC‑I, R, MR, Alpha One & Gen II (s/n 0K999999 and below) (1970‑1997) 20-24 Teeth 1.98/1.94 & 2.40 Ratio Special Order Item.

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      • Mercruiser 43-828073A-1 Reverse Gear Kit
        $184.49
        $160.49

        Mercruiser 43-828073A-1 Reverse Gear Kit Genuine OEM Mercury-Mercruiser part. Fits: Alpha I Gen II 21 Teeth Application: Alpha One (Gen II) 1998 & Up - s/n 0L100040 & up Alpha One (Gen II) 1996-1997 - s/n 0F680000 thru...

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      • Mercruiser 43-853641A-2 Upper Gear Set - 1.47
        $607.99
        $528.99

        Mercruiser 43-853641A-2 Upper Gear Set - 1.47 Genuine OEM Mercury-Mercruiser part. Fits: Alpha One Gen II (s/n 0L000040 and above) (1998 & newer) 22-20 Teeth 1.47 Ratio Special Order Item.

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      • Mercruiser 43-853642A-2 Upper Gear Set - 1.94/2.4
        $777.49
        $676.49

        Mercruiser 43-853642A-2 Upper Gear Set - 1.94/2.4 Genuine OEM Mercury-Mercruiser part. Fits: Alpha One Gen II (s/n 0L000040 and above) (1998 & newer) and Vazer drive 20-24 Teeth 1.94 & 2.40 Ratio Alpha One Gen II 2.77 Ratio...

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      • Mercruiser 43-853643A-2 Upper Gear Set - 1.81
        $534.99
        $465.49

        Mercruiser 43-853643A-2 Upper Gear Set - 1.81 Genuine OEM Mercury-Mercruiser part. Fits:  Alpha One Gen II (s/n 0L000040 and above) (1998 & newer) & Vazer drive 17-19 Teeth 1.81 Ratio Alpha One Gen II 2.58 Ratio Vazer Special...

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      •  Mercruiser 43-878087A-2 Forward Gear Set
        $684.99
        $595.99

        Mercruiser 43-878087A-2 Forward Gear Set Genuine OEM Mercury-Mercruiser part. Fits: Alpha One Gen II (except 2.00 & 2.40 ratio) (s/n 0F680000 and above) 13‑21 Teeth  Standard Rotation (RH) Special Order Item.

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      • Mercruiser 43-887906A-1 Bravo Upper Gear Set
        $2,195.99
        $1,910.49

        Mercruiser 43-887906A-1 Bravo Upper Gear Set Genuine OEM Mercury-Mercruiser part. Fits: Bravo I X & XZ (1.36), II X (1.50 & 1.81) & III X (1.36 & 1.81) (2000 & newer) 27/29 Teeth Special Order Item.

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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.

      Shop for Your MerCruiser Gearcase and Drive Part Needs

      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. You can depend on Wholesale Marine to provide high quality Mercury outboard parts and Mercury sterndrive parts from the top brands in the industry. 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 Rewards Program, shipping perks, and price match guarantee are added bonuses to ensure each and every customers’ satisfaction. Remember you can always depend on Wholesale Marine for high quality Mercury outboard parts and Mercury sterndrive parts from the top brands in the industry. So plan to call us for all your boating needs today!