The ConsuLab EC-1106-3 cutaway Allison transmission has been specifically designed for teaching heavy duty automatic transmission theory and operation. It has been strategically sectioned and c utaway to allow students to visualize the internal transmission functions. The Allison 3000 series is a fully automatic torque converter driven, electronically controlled 6-speed automatic transmission that is commonly used in coaches and heavy vehicles. The other Allison Series are available on request.