Allison 1000 Automatic Transmission Power Flow

Weber State University (WSU) - Automotive Technology Department - Transmission Lab. Allison 1000 MW7 6-Speed and M74 5-Speed 6-Speed Automatic Transmission Power flow. The Allison 1000 is built by Allison Transmissions, a General Motors owned company. This tansmission is typically used in 2001 and newer Chevrolet Silverado and GMC Sierra Heavy-Duty C and K series pickup trucks with the Isuzu Duramax engine. This transmission uses a simple planetary gear set to drive a Simpson planetary gear set (common sun gears). The following summarizes the changes to the Allison 1000 over the years: (2010 Uprate) MW7 - Strengthened to handle the higher torque capability of the 2011 model year Duramax LGH and LML engines. 4th Generation MW7 - Added 6th gear and other software refinements in 2006. Used with the 2006 - 2010 LBZ, LLY, and LMM Duramax engines. 3rd Generation M74 - Added Solenoid “G“ to the valve body to modulate main pressure at an idle to quiet the oil pump and reduce engine