Description
The ZF 305-3 Marine Transmission is a reverse reduction gear offered with a broad selection of listed ratios for marine propulsion planning. The product page states that 12 ratio options span 0.884:1 to 2.917:1, covering overdrive, direct-drive, and reduction configurations. Its listed hydraulic multi-disc clutch, seawater-resistant aluminum-alloy housing, “Lambda” beveloid gear design, and standard 7° down angle are key details to consider when evaluating a transmission for a vessel and propeller plan before confirming the selected ratio for the intended installation.
Key specifications
- Model: ZF 305-3 Marine Transmission
- Listed ratio range: 0.884:1 to 2.917:1
- Ratio options: 12 stated on the product page
- Clutch type: Hydraulic multi-disc
- Housing material: Seawater-resistant aluminum alloy
- Gear design: “Lambda” beveloid principle
- Standard down angle: 7°
- Control options listed: Mechanical, electrical, and SUPERSHIFT
- Quality standard listed: ISO 9001 compliant
Applications and compatibility
The live product page presents the ZF 305-3 for a range of marine propulsion applications, including luxury motoryachts, sport fishers, express cruisers, workboats, performance yachts, cruising yachts, patrol boats, trawlers, tugs, barges, commercial fishing vessels, and specialized vessels. It also describes the ratio range as relevant to planing and displacement craft. These are application references, not universal fitment confirmation. The appropriate configuration depends on the vessel’s hull form, engine power and torque curve, target cruising and maximum speeds, propeller diameter and blade-area requirements, and operating profile, as noted on the page.
For speed-oriented applications, the 0.884:1 and 0.923:1 ratios are described as overdrive options. The 1.000:1 ratio is listed as direct drive for balanced performance. The page links the reduction choices to progressively greater torque or thrust needs and lower-speed operation. Listed examples include 1.220:1, 1.297:1, 1.486:1, 1.758:1, 1.968:1, 2.250:1, 2.500:1, and 2.917:1. Review the ratio description alongside the vessel’s intended use rather than choosing solely by whether a ratio is overdrive or reduction.
Buyer guidance
Begin with the required ratio, then confirm the preferred control option and all installation requirements against the existing propulsion layout. The product page notes that professional installation and regular maintenance are required considerations, and that additional components may be needed. It also cautions that overdrive ratios reduce available propeller torque and may require smaller propeller diameters. Confirm the selected ratio and installation-specific requirements with the seller before ordering. The page does not state package contents, dimensional fitment data, rated power or torque figures, or warranty terms, so those points should be confirmed separately for the intended installation.
Fitment and ordering notes
- Confirm the exact model, part number, configuration, dimensions, and application against the information shown in this listing.
- Review the product images and listed attributes before ordering; fitment can vary by vehicle, equipment, year, and installation setup.
- Contact X Factor Motorsport for availability, fitment, product questions, or freight guidance before purchase.
