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Member
Posts: 9
Location: Vernon, FL | I have a F350 2006 and when I am in Tow/haul mode if I brake quickly the whole rig jerks as if I am down shiffing immediatey to first gear. Is that the way it's supose to be? |
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Extreme Veteran
Posts: 500
Location: West TN | When you have it in Tow/Haul you will experience this feeling. The transmission is downshifting for you. You will know how to tell by watching your RPMs. They will increase when it downshifts at first. This will also happen when you go down a hill and the truck senses it as well. |
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Expert
Posts: 1719
Location: PA | I have tow/haul too and I don't experience this jerking. Could it be that you are too close to the weight limit or just braking too hard? |
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Elite Veteran
Posts: 602
Location: md | My f350 2005 tow haul jerks something terrible. The rpms go up real high if I even just let it coast down hill lets say, to avoid braking so much. |
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Expert
Posts: 1719
Location: PA | What do you tow? |
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Member
Posts: 9
Location: Vernon, FL | The kick happens if I'm pulling an emply trailer or a full heavy load. I love the auto down shiffing coming down a mountain but if I brake hard from say 40 to 10mph it kicks hard. |
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Extreme Veteran
Posts: 500
Location: West TN | Mine will do the same thing as well. I have noticed on my 06 that the harder you push the brake, the more out put you have. This is different than the aftermarket brakes I was used to. You set how much braking the trailer had and it would remain constant. With the new controller, it seems that the brake pedal is changing the amount of braking the trailer has, just like it would the truck. This can be monitered by seeing how many bars you have on the output when braking. |
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Elite Veteran
Posts: 1160
Location: Denver Colorado | Grade down shifting is nice on the Ford 5R110 and the GM T1000 Allison, in tow mode. It locks up the torque converter so you are locked up mechanically like a manual transmission, giving you 100% power transferred from engine to transmission instead of the auto tranny fluid coupling slipping like we are use to with automatics. Drive a two ton truck with the Allison and it jerks even more. That's the characteristic of lockup down shifting. Plus you have more line pressure which causes some jerk too. It's takes more brake pressure on the Ford to downshift than the Allison. The new Ford TowCommand trailer brake controller does change with the trucks brakes as it's activated by the trucks hydraulic brake pressure. Very fast reaction time and it does brake more with higher speeds. Hardly any brake when driving slow, which can cause problems in the mountains when you want brake pressure at slow speeds. I hope Dodge and GM come out with a factory trailer brake controller also. I think this is an option that's here for good, like cruise control heated seats. I love heated seats. |
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Expert
Posts: 1416
Location: sc | if you want to be able to tow the heavy weight, you have to pay the price. a 1 ton is not going to behave like a family car. |
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Extreme Veteran
Posts: 366
Location: Albany, Oregon | Originally written by MrTruck on 2005-11-16 12:05 AM I hope Dodge and GM come out with a factory trailer brake controller also. Better yet.....make a place to put the aftermarket controlers!!! |
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Expert
Posts: 1719
Location: PA | Are you referring to Ford's integrated braking system and the tow/haul mode? I have a prodigy controller and the tow/haul. |
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Expert
Posts: 2689
| Originally written by redcow on 2005-11-15 2:12 PM
The kick happens if I'm pulling an emply trailer or a full heavy load. I love the auto down shiffing coming down a mountain but if IĀ brake hardĀ from say 40 to 10mph it kicks hard.
In addition to what has already been said,
a) Braking HARD is probably a key clue
b) the speed range 40 to 10 is the other one.
Between 40 and 10 means you're going through the normal downshifting range. You're getting grade braking - a FEATURE ! as well as downshifting. On GMs (Fords are similar) those downshifts will be at higher sppeds when in tow/haul than when not. It shouldn't be HARSH, but you should expect to feel it.
I have a LOT of harsh criticism about getting oneself into situations that need hard braking on downgrades with a trailer in tow, especially when horses are on board - I guess I should save that, or I'll get moderated (-:
Nahh, free advice is worth every penny; Drive down that mountain road in a low enough gear to not need hard braking in the 40 to 10 range. Your horses will thank you and you can stop worrying about this symptom.
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