Down shift problem in tow/ haul mode
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Cross-Country
Joined: Jun 2008
Posts: 79
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From: Warrenville, S.C.
Down shift problem in tow/ haul mode
Installed a rebuilt transmission from ford in my 2004 f 350 and when pulling my camper in tow/haul mode down hill it downshifts into low gear and acts like the drivetrain is coming out from my truck. Only does this when pulling a load and in tow/haul mode going downhill. Acts likes it’s shifting into low too soon. My question is how or if you can adjust when it downshifts?
Cargo Master
Joined: Oct 2018
Posts: 2,811
Likes: 1,908
From: unfortunately Germany
I don't have a new trans in the truck (60000mls stock), but here it's the same.
The transmission shifts to a low gear very early and the engine "sings" in high notes.
I had already thought about retrofitting an engine brake
The transmission shifts to a low gear very early and the engine "sings" in high notes.
I had already thought about retrofitting an engine brake
Tuned
Joined: Jan 2002
Posts: 409
Likes: 106
From: Wasilla
Sounds like tow/haul is working as designed. If more braking is needed why not simply adjust the programming rather than adding a separate engine brake that was not part of the system design? my .02, Russ
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Cross-Country
Joined: Jun 2008
Posts: 79
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From: Warrenville, S.C.
I know it’s suppose to downshift going downhill but when it shifts into low gear it sounds like all the gears are grinding and coming out from under the truck. It is like it’s downshifting too soon.
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Joined: Jul 2014
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From: Houston, Texas
Yep. You have to keep a light foot on the brake to keep the Tow/Haul mode from freaking out, thinking you are barreling out of control down a mountain. I find it helps a whole lot if you slow down a lot prior to the descent..
Cargo Master
Joined: Oct 2018
Posts: 2,811
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From: unfortunately Germany
that's how I do it too. If I ride slowly in 5th gear and push T/H, the trans shift to 3rd gear. Then i drive for example downhill serpentines, the engine revs up and slow down the truck(by the way, you can hear how the clattering of the injectors stops when truck drive downhill). if i now slow down, brake and drive a curve, he shifts me into 2nd gear. But it don't "bang" anything if the thread creator means something like that.
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