Double overdrive is an overdrive driving an overdrive. Like an RTOO14613. Over drive in the main case and auxiliary section. A set of boxes both with overdrive.
Maybe cuz the 15 over was against the dash they call it double over......I gotta say it chaps my ### when they do lol.
13 speed shift knob air lines
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by W Bench Farms, Jan 7, 2022.
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