Cub Cadet/Troy-Bilt TILLER TRANSMISSION - 918-04003

Troy-Bilt Tiller Transmission Kit (OEM)

Part Number: 918-04003
Description: Tiller Transmission Kit
Condition: New OEM Troy-Bilt Part
This part replaces: 618-04003

The Troy-Bilt Tiller Transmission Kit (918-04003) is a genuine OEM replacement transmission kit designed for select Troy-Bilt rear-tine tillers, including Horse and Big Red models. This kit restores proper drivetrain performance, dependable tine engagement, and smooth operation—ideal for repairing worn, damaged, or failing transmission components.

If your tiller is grinding, slipping, not driving the tines properly, or losing power under load, replacing the transmission with a new OEM Troy-Bilt transmission kit helps bring your tiller back to factory performance.

Key Features

• New OEM Troy-Bilt transmission kit

• Restores proper tiller drive and tine engagement

• Designed for Horse & Big Red rear-tine tillers

• OEM fit for reliable performance and long service life

• Ideal replacement for worn or failing transmission systems

Compatible Troy-Bilt Models

This transmission kit fits the following models:

Horse / Big Red (2016–2025)

• 21A-682T766 – Horse (2016–2021)

• 21AE682W766 – Big Red (2016–2022)

• 21AE682WB66 – Big Red (2023–2025)

Additional Compatible Models

• 21A-682J063 – 8HP Roto-Tiller (2002–2003)

• 21A-682J766 – 8HP Roto-Tiller (2004) / Horse Roto-Tiller (2005)

• 21A-683F766 – 8HP Roto-Tiller (2005–2007)

• 21AE682L063 – 10HP Roto-Tiller (2002–2003)

• 21AE682L766 – 10HP Roto-Tiller (2004) / Big Red Roto-Tiller (2005)

• 21AE683F766 – 8HP Electric Roto-Tiller (2005–2006)

• 21AE683G766 – 10HP Electric Roto-Tiller (2005–2007)

• 21AE686N063 – 8HP Roto-Tiller (2003)

• 21AE686N766 – 8HP Electric Roto-Tiller (2004) / Horse Roto-Tiller (2005)

Notes

• Verify your model number before ordering for proper fitment

• Professional installation is recommended

• OEM part ensures correct fit and factory-quality performance