6R80 Transmission Features and Benefits
Offers six forward speeds, with gear ratios of 4.17, 2.34, 1.52, 1.14, 0.87, and 0.69:1. The US-produced Ford 6R80 transmission is based on the robust ZF 6HP26 design, which has been used by automakers world-wide for over 14 years. Enhancements were added by Ford to further improve the transmission, including the addition of a ratchet-style low one-way clutch, and removal of the internal TCU for the 2011 model year, easily enabling stand-alone control. The 6R80 has already been field-proven to accept up to 1000HP in stock form, with only ECU tuning. With aftermarket components, the 6R80 will likely handle much more power. Stock applications already employ a multi-plate torque converter clutch, enabling greater power handling in lockup. Despite having 6 forward gears, the transmission is only slightly larger and heavier than light-duty four-speed automatics, such as the 4L60E and 4R70W.
This six-speed transmission features an elegant, robust, band-free design that is simpler than most four speed automatic transmissions. It uses five clutch packs and a single one-way clutch to achieve six forward ratios, whereas most four speed units utilize six or more clutches and/or bands, with at least one one-way clutch to achieve four gears. This allows better reliability, better shift quality, and reduced rotating mass.
The gear ratios offer a generous ratio spread of 6.04:1 from first to sixth gear, and the ratios are very close together, rivaling most four-speed transmissions. From second to sixth gear, the ratios are extremely close, providing world-class performance.
There is already a growing ecosystem of swap parts available for the 6R80, including bell housing adapters for various non-modular Ford V8s, with others likely to follow. Stifflers is also producing bolt-in transmission cross-members for Fox body and SN95 Mustang applications, with other applications in the works.