Mercruiser Gearcase & Drive Parts

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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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      • CLEARANCE
        Sierra 18-2257 Upper Gear Kit
        $601.99
        $403.49

        Sierra 18-2257 Mercruiser 1.65:1 Upper Gear Kit Sierra replacement Upper Gear Kit for Mercruiser Inline 6 Cylinder Engines with a 1.65:1 Gear Ratio. Ratio: 1.65:1 Driver Gear: 24 teeth Driven Gear: 24 teeth For: 6 cyl. inline engines Kit...

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      • Sierra 18-2295 Mercruiser Shim Kit
        $30.99
        $23.49

        Sierra 18-2295 Mercruiser Shim Kit Sierra shim kit for Mercruiser Vazer Drives. Fits: Mercruiser Vazer Lower Drive Shaft Bearing Kit Contains: (1) of each - .002, .003, .005, .010, .020 Interchangeable with GLM 23300 Mercruiser...

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      • Sierra 18-2348 Clutch Cross Pin Spring
        $4.99

        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), Mercruiser - MR/Alpha  I/O, 1MC-1/R/MR/Alpha...

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      • CLEARANCE
        Sierra 18-2368 Lower Gearcase Seal
        $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 Drive 43-803071T1 Application: Mercruiser Stern Drive Alpha One Gen II 1996-1997 s/n...

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      • CLEARANCE
        Sierra 18-2369 Lower Gearcase Seal
        $508.49
        $340.99

        Sierra 18-2369 Lower Gearcase Seal Sierra replacement lower gearcase seal for Mercruiser Alpha/Gen II 1991-95. Interchangeable with: GLM 25135 Mercruiser Stern Drive 43-803069T1 Application: Mercruiser Stern Drive Alpha One Gen...

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      • Sierra 18-2410 Gear Set
        $354.49
        $247.99

        Sierra 18-2410 Forward Gear Set Sierra replacement forward gear set for Mercruiser Stern Drives. Fits: R Drives Interchangeable with: GLM 11100 Mercruiser Stern Drive 43-96084A5 43-96084A7

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      • Sierra 18-2415 Lower Unit Housing
        $1,821.99
        $1,275.49

        Sierra 18-2415 Lower Unit Housing Sierra replacement lower unit housing for Gen II engines. Sierra aftermarket engine parts are manufactured to meet or exceed OEM requirements. For ratios: 1:47:1, 1:62:1 Fits: Gen II (1998 & Up) S/N (0L100040...

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      • Sierra 18-2516-9 Outdrive Seal (Priced Per Pkg Of 5)
        $40.99
        $33.49

        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 with: GLM 39640 Mallory 9-62604 Mercruiser Stern...

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      • Sierra 18-4858-9 Washer  (Pack Of 10)
        $25.49
        $17.99

        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 units Package of 10 Interchangeable...

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      • Sierra 18-7114 O-Ring
        $1.99
        $1.49

        Sierra 18-7114 O-Ring Sierra replacement O-ring. I.D.: 1.000" or 25.4mm Width: 0.135" or 3.4mm Sold in intervals of 5. Interchangeable with: Chrysler/Force/US Marine 25-23145 GLM 82140 Johnson/Evinrude...

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      • Sierra 18-7156-9 O-Ring (Pkg Of 5)
        $15.49
        $11.99

        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 2.5mm Package of 5 Interchangeable...

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      • CLEARANCE
        Sierra 18-7175 O-Ring
        $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

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      •  Sierra 18-7321-9 Bellows Clamp (Pkg Of 5)
        $12.99
        $9.99

        Sierra 18-7321-9 Mercruiser Bellows Clamp Replaces 8M0204733 (Pkg Of 5) Sierra replacement bellows clamp for Mercruiser Stern Drives. Package of 5 Interchangeable with: GLM 21790 Mallory 9-73115 Mercruiser Stern...

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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!