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Re: Overdrive Off vs. Tow/Haul
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Never have seen a Torqueshift with a O/D button on the stalk, only tow/haul.
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TorqShift transmissions in the 6.0L diesel vans have OD off, not tow/haul. I have no idea why, but that's the way it is.
OD off prevents the transmission from shifting to the highest gear, which is overdrive.
Tow/Haul changes the shift schedule so that it shifts to a higher gear at a higher RPM than in the normal mode. This helps move the heavier load. Also, the Tow/Haul will automatically downshift to help with engine braking. Tow/Haul will allow the transmission to shift to all gears including overdrive.
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