Chevrolet Volt 4ET50 Transaxle Components and Operation General Description at 2:20 Major Components at 2:50 EV Mode at 5:00 Electric Only Combined (Engine Off) Mode at 9:20 Extended Range Mode 11:23 Mountain Mode at 14:58 Disassembly at 16:16 Powerflow at 23:36 Summary at 27:30 Weber State University (WSU) - Department of Automotive Technology - Transmission Lab. This video shows the components and operation of a 2013 Chevrolet Volt 4ET50 Extended Range Transaxle. This transaxle has four modes of operation as well as 4 possible operational states. This transaxle design was used in Chevrolet Volts from 2011-2015. The 2016 and above models of the Volt use a different model transaxle. I made an error on the Motor B to tire gear ratio, it is actually 7.001:1. The planetary gear reduction is (1+(83/37)) = 3.243:1 The transfer gear reduction is (67/79) = 0.848:1 overdrive The final drive gear ratio is (79/31) = 2.548:1 The result is 3.243*0.848*2.548 = 7.001