DETROIT -- The writing is on the wall for medium-duty hydraulic transmissions. General Motors Corp.’s Allison Transmission Div. says it will cease taking orders for hydraulic units by this time next year. All gearboxes after that will be electronically controlled. The last models being phased out by Alison are the MT 643 and 653 and the AT 545. Allison says it began the move to electronic transmissions in 1991. The company will continue to make service parts for its AT and MT products as ...
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