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08 3500 in Tow Haul mode

   
Old Oct 22, 2018 | 08:14 PM
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Default 08 3500 in Tow Haul mode
I have a 08 3500 DRW 6.7L Diesel 160K miles.
I use the truck to haul a 15K lb 5th wheel. When towing I have it in Tow Haul mode. On acceleration it shifts fine. When I decelerate it down shifts kind of hard. If I take the tow haul off when I decelerate it's nice and smooth.
Anyone have this issue? Or what might be going on?
TIA.
 
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Old Oct 23, 2018 | 08:36 AM
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I think that's normal, the pcm gives harder shifts to aid in engine braking, and not allow the clutches to slip quite as much.
 
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Old Oct 27, 2018 | 09:13 PM
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Should be using your exhaust brake, tow haul raises the down shifting rpm and holds lockup to 2nd gear to keep rpms high and make the brake most effective
 
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