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      Mercruiser Gearcase & Drive Parts Product Listings

      • Sierra 18-2286 Shift Spool Assembly
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        $129.19
        $93.09

        Sierra 18-2286 Shift Spool Assembly Special Order Item

      • Sierra 18-2348 Clutch Cross Pin Spring
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        $6.59
        $6.19

        Sierra Clutch Cross Pin Spring Special Order est. 10 Days For use on Mercury/Mariner Outboard Engines 70, 75, 80, 90, (serial # A996142 & later), 100, 115, 125, 4 cyl. (serial # B209468 & later),...

      • CLEARANCE
        Sierra 18-2368 Lower Gearcase Seal
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        $525.99
        $352.49

        Sierra 18-2368 Lower Gearcase Seal Sierra replacement lower gearcase seal for Mercruiser Alpha/Gen II 1996-97 Interchangeable with: Mercruiser Stern...

      • CLEARANCE
        Sierra 18-2405 Gear Repair Kit Replaces 43-803091T1
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        $682.39
        $457.19

        Sierra 18-2405 Mercruiser Gear Repair Kit for MR and Alpha 1 Drives Sierra high-quality engine parts are designed to meet OEM specifications.  Kit Includes: (1) 18-1117 Pinion Bearing (1)...

      • Sierra 18-2516-9 Outdrive Seal (Priced Per Pkg Of 5)
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        $46.59
        $38.69

        Sierra 18-2516-9 Outdrive Seal (Priced Per Pkg Of 5) Sierra high-quality replacement engine parts are designed to meet OEM specifications. For All Bravo Outdrives. Interchangeable...

      • Sierra 18-4858-9 Washer  (Pack Of 10)
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        $27.79
        $19.99

        Sierra 18-4858-9 Washer (Pack Of 10) Sierra pack of washers for Mercury Outboards and Mercruiser Stern Drives. Fits: Mercury O/B 25 Hp & Up, MerCruiser #1, R, MR, Alpha I Gen II and Bravo Drive...

      • Sierra 18-7156-9 O-Ring (Pkg Of 5)
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        $17.49
        $14.89

        Sierra 18-7156-9 O-Ring (Pkg Of 5) Sierra replacement O-ring for Mercury, Mercruiser, Johnson/Evinrude, and OMC engines. Supersedes 18-7156 I.D.: 1.185" or 30.1mm Width: 0.100" or 2...

      • CLEARANCE
        Sierra 18-7175 O-Ring
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        $4.99
        $3.49

        Sierra 18-7175 O-Ring Package of 5 O-Rings. I.D.: 3.750" or 95.3mm Width: 0.270" or 6.9mm Interchangeable with: GLM 88170 Mercruiser Stern Drive 25-62817

      • Sierra 18-7426-9 O-Ring (Priced Per Pkg Of 2)
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        $4.19
        $3.29

        Sierra 18-7426-9 O-Ring (Priced Per Pkg Of 2) Sierra high-quality engine parts are designed to meet OEM specifications. For Mercury and Mercruiser engines. I.D.: 0.740" Width: 0...

      • Mercruiser 8M0147076 Bravo 3 300 Hour Service Kit Thumbnail Image
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        $728.99
        $607.49

        Mercury 8M0147076 Mercruiser Bravo 3 Sterndrive 300 Hour Service Kit Maintain your MerCruiser Bravo 3 sterndrive with this complete 300-hour maintenance kit designed for models from 2003 to newer...

      • Mercruiser 8M0147072 Alpha One Outdrive 300 HR Service Kit
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        $651.49
        $546.99

        Mercruiser Alpha One Outdrive 300 Hour Service Kit This Mercruiser Alpha One Outdrive 300 Hour Service Kit has everything needed to service your outdrive in one convenient kit. For Alpha One...

      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 Wholesale 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!