2-speed gearbox SL8 upgrade set. All new superlight 2-speed gearbox for 966, with lowest inertia, 8mm shaft, improved gears and oneway. See details and image gallery. Also download pdf manual.
Serpent ( Michael Salven ) designed a new super-light ( SL) gearbox for the Serpent 1/8 966 .
The current Serpent gearbox system has been in use for a very long time, and the Serpent design has become the industry standard, with small revisions only. Stronger engines, research, racing and new insights fueled the new gearbox design.
Goals were to reduce inertia, fluent power transfer and increase reliability even further .
All info here: http://www.serpent.com/product/903360/