Shafts, Gears, and Clutches
WARNING: This page is about a different car, the 2013 Honda Odyssey, 2012 Honda Odyssey, and 2011 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
Four parallel shafts hold gears and clutches. The gears on the input shaft (mainshaft), the secondary shaft, and the intermediary shaft are in constant mesh with those on the output shaft (countershaft). When specific gears are engaged by the clutches, power is transmitted through the mainshaft, to the secondary shaft, the intermediary shaft, and/or the countershaft, then to the final drive gear of the differential to provide drive.