Twin Disc Marine Transmissions

Twin Disc has been making marine gearboxes since 1918.

Moon Engines can offer a wide selection of rebuilt and reconditioned units that are fully tested and come with a warranty, ready for immediate use. Since configurations can vary—such as reductions, ratios, and output directions—it's helpful to provide the gearbox number from the unit's tag or send us a photo via email for identification. Don’t hesitate to call us for further assistance.

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Common units & reductions in stock:

These include; xxxxx, xxxxx, xxxxx, xxxxx, xxxxx

Gearboxes available in varying ratios

Second-hand rebuilt or new units available.

Moon Engines also carry many parts for Twin Disc Marine Gearboxes including stock of second-hand parts.

Why Choose Moon

All Twin Disc gearboxes are tested at operating temperature for one hour, and every Twin Disc transmission comes with a warranty. All rebuilt units are thoroughly stripped, cleaned, measured, and checked before assembly, so you can rest assured that a Twin Disc transmission rebuilt by Moon Engines receives full attention to detail, making it an extremely reliable alternative to a new Twin Disc transmission.

For your convenience, Moon Engines offers a full removal, service, rebuild, and reinstall service. Whether you want us to handle the entire job or just a part of it, we’ll take care of everything for you—from removing your Twin Disc transmission from your boat to reinstallation and sea trials—so you can relax knowing the job will be done properly.

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Hear from our valued clients

Christopher Grubb
				Hats off to James and Terry, when my boat's transmission acted up during a planned holiday, I reached out to them in a bit of a panic, but they pulled through and saved the trip. James diagnosed the issue quickly, Terry jumped right on it and had my transmission back in shipshape in no time. Plus, the pricing was fair and upfront, no surprises. If you're in a pinch with your boat, these guys are the ones to call. Quick, efficient, and fair - can't ask for much more than that! Big thanks guys 🚤🔧👍 Cheers, Chris
Brendon Stuckey
				I am very hands on with my maintenance but consider James a go to person who I call on regularly, he gives genuine pragmatic advice rather than a sales pitch which is very helpful, highly recommended!
MIKE WILSON
				So helpfull especially Jim whom on his advice (free by the way)saved me 1000s on my capital gearbox problems
Howard Grazier
				A huge thanks to James and the Team at moon engines, Long story but the boat I had had the wrong gearbox ratio, resulting in the prop only spinning at about ½ the speed it should have been, James sorted me out a deal on a new gearbox and installed for me all within discussed and agreed budget. This was an older boat and must say was impressed with their attitude compared to some other places I would highly recommend moon engines for any engine or transmission work, they know their stuff and are super helpful
Troy Kean
				These guys are great! Service well and above the required
Warwick Beauchamp
				I highly recommend Moon engines for new and secondhand marine engines. James is honest as the day is long and will ensure you get the best deal if you're repowering, building a new boat or need servicing. They also specialise in marine gearboxes particularly PRM marine gearboxes. They also did a great job on the injectors of my Nissan diesel! Warwick Beauchamp ActionCOACH

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