This is an aftermarket mower deck gearbox, also called a gearcase, for compatible John Deere equipment. It transfers drive power through the deck gearbox assembly so the mower deck can operate as intended when the original gearbox is worn, leaking, or damaged. Built to match OEM This replacement gearbox is built to match the original-style form, mounting layout, and drive function. It is intended to line up with the existing mower deck gearbox location and work with the surrounding deck drive components when installed on the correct application. Installation Installation is a straightforward deck gearbox replacement for a mechanic with normal hand tools and basic shop equipment. Match the part to your machine before starting, transfer any required related hardware from the old assembly as needed, and check lubricant, seals, and belt or shaft alignment during reassembly. .product-description-v2 { font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica, Arial, sans-serif; color: #1d1d1d; line-height: 1.55; max-width: 720px; } .product-description-v2 > div { margin-bottom: 18px; } .product-description-v2 h3 { font-size: 16px; font-weight: 700; color: #1d1d1d; margin: 0 0 8px; } .product-description-v2 p { margin: 0; font-size: 15px; } @media (max-width: 768px) { .product-description-v2 { font-size: 15px; } }