Aggressive trans going down hill!
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More Turbo
Joined: Sep 2019
Posts: 571
Likes: 56
Aggressive trans going down hill!
I pull a 16k pound horse trailer With my 19 dually. With tow- haul on, if I have to slow down it will downshift and hold lower gear until I reach bottom of hill. It does not like to upshift on a downgrade. I even tried it today with no TH mode and it was the same! Is everyone just using the manual shift buttons??
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More Turbo
Joined: Sep 2019
Posts: 571
Likes: 56
possibly. It was In 3rd gear at 3k RPM and I didn’t want to rev it much harder.
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
It can rev to 3500 pulling, and higher (4200) if holding back a load, it requires the throttle input to know it can shift up as it will lose its holding power once upshifted. Its just making sure you really want that before it upshifts because it knows it likely cant go back to that gear unless you use the foot brake, or the trailer brake. This is because it is load sensing, so your trailer is contributing to this as well. So, same hill empty, no trailer, would require a bit of throttle to upshift, add the trailer, it will require more, add a load to the trailer or a steeper hill, even more.
Hotshot
Joined: Oct 2015
Posts: 19,711
Likes: 12,853
From: Wyoming
I have the same problem. You have to rev it really hard. Much harder than you should, like 1500 rpm over what it's at. In my opinion, there's something jacked up in the software programming of the transmission. This is a complaint that has been made by numerous forum members. It only happens when going downhill and towing, while using the tow mode. I believe that using just the exhaust brake exhibits the same problem, but I rarely have just the exhaust brake on so I can't confirm that.
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Postmaster
Joined: Jan 2019
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I have the same problem. You have to rev it really hard. Much harder than you should, like 1500 rpm over what it's at. In my opinion, there's something jacked up in the software programming of the transmission. This is a complaint that has been made by numerous forum members. It only happens when going downhill and towing, while using the tow mode. I believe that using just the exhaust brake exhibits the same problem, but I rarely have just the exhaust brake on so I can't confirm that.
Laughing Gas
Joined: Jul 2020
Posts: 978
Likes: 459
These transmissions appear to be somewhat capable of learning how you drive. The More miles you put on
the better it anticipates what you want it to do. I rarely use the brakes any more to the point it’s almost dangerous because because of my brake lights are not lit when stopping. I turn on exhaust brake every time I start the engine when slowing down just tap brake pedal once to make it downshift when I want next lower gear, tap throttle once to shift up. Truck is grossing 10k every day it’s on the road, has 117k miles and rear pads are still factory pads changed front ones at 98k miles still original rotors. Cheers
the better it anticipates what you want it to do. I rarely use the brakes any more to the point it’s almost dangerous because because of my brake lights are not lit when stopping. I turn on exhaust brake every time I start the engine when slowing down just tap brake pedal once to make it downshift when I want next lower gear, tap throttle once to shift up. Truck is grossing 10k every day it’s on the road, has 117k miles and rear pads are still factory pads changed front ones at 98k miles still original rotors. Cheers
More Turbo
Joined: Feb 2015
Posts: 699
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From: DFW
I have the same problem. You have to rev it really hard. Much harder than you should, like 1500 rpm over what it's at. In my opinion, there's something jacked up in the software programming of the transmission. This is a complaint that has been made by numerous forum members. It only happens when going downhill and towing, while using the tow mode. I believe that using just the exhaust brake exhibits the same problem, but I rarely have just the exhaust brake on so I can't confirm that.
