4 Speed All Wheel Drive Sequential Gearbox | Here is a very solid All Wheel Drive 4 Speed Sequential Gearbox using all of the new gearbox elements... It also features a lock-out
Sariel.pl » gearbox
Ultra Compact 8+N+R Sequential Gearbox - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
LEGO MOC 8-Speed manual gearbox by Whathetech | Rebrickable - Build with LEGO