Toyota GD6 1GD/2GD 4X2 6SPD Manual Gearbox

The Toyota RC60 series (specifically the RC60 and RC61 ) is the 6-speed manual transmission designed to pair with the 1GD-FTV (2.8L) and 2GD-FTV (2.4L) Global Diesel engines. Commonly found in the Hilux and Fortuner, this gearbox was engineered to replace the older 5-speed units, providing better torque handling and improved fuel efficiency. Key Specifications & Features Type: 6-Speed Triple-Cone Synchromesh Manual. Torque Capacity: Designed to manage the high low-end torque of the GD series, typically handling up to 420Nm in manual configurations. Gear Ratios: Features a very low 1st gear (approx. 4.78:1) for heavy departures and towing, with a tall 6th gear (approx. 0.64:1) acting as a double-overdrive for quiet, economical highway cruising. iMT (Intelligent Manual Transmission): Many models equipped with this gearbox feature a rev-matching function that automatically adjusts engine speed during upshifts and downshifts for smoother transitions. Weight Reduction: The casing uses high-pressure die-cast aluminum to shed weight while maintaining structural rigidity for 4×2 workhorse applications. Performance Characteristics The RC60/61 is known for its “truck-like” durability but with more refined shift throws than its predecessors. In the 4×2 configuration , the gearbox is direct-drive to the rear wheels, making it simpler and lighter than the 4×4 transfer case versions. Gear Ratio (Approx.) Purpose 1st 4.784 High-torque take-off / Heavy loads 5th 0.777 Overdrive (Urban cruising) 6th 0.643 Deep Overdrive (High-speed economy)