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  1. Watching the Volt’s 4ET50 transmission shift gears in extended-range mode

    Hybrid and Electric Vehicle Competitors
    By George Bower Does anyone remember “double clutching?” I do. It was a method of shifting a crash box (i.e., non synchromesh) transmission to “synchronize” speeds before a downshift. For example, on a shift from 4th to 3rd gear you would shift from 4th to neutral, let out the clutch and raise...
  2. Solving the Volt’s Extended Range Combined Mode Power Split

    Hybrid and Electric Vehicle Competitors
    Author’s note: This is a Volt Powertrain 101 article. The following are not official GM numbers and this analysis should be considered approximate only. The numbers used are based on a very long thread in the GM-Volt forum which can be found here . By George Bower   Remember when GM finally...