Ryan, a torque amplifier is a planetary gear set that replaces the input shaft of the transmision. The ta has a clutch, that when engaged, locks the whole unit together, giving you a 1-1 ratio, thus acting like a regular input shaft. When the clutch is released, the power is transmitted through the planetary gears giving about a 30% reduction. It was shift on the fly, and offered 2 speeds in each range, a big plus in the day!
