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Old 04-10-2016, 09:36 AM   #11
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Originally Posted by Seann45 View Post
Tow haul mode does not take you out of over drive (at least it does not on my Duramax/Alison) it does however change the shift points to give you more grunt.. and (on my truck anyway) it enables drive line braking
My Ford is essentially the same: Tow/haul mode does have overdrive (actually torque converter lockup), changes shift points, and enables engine braking (transmission downshifts) when going downhill and touching the brake pedal.

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Old 04-11-2016, 07:33 PM   #12
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Yeah, it says D is overdrive and you can run it in D with or without Tow/Haul but it still references D as overdrive. In other words, I don't think you "turn off" overdrive on this vehicle. I think the tow/haul function has replaced that.

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