‘17 F 350 bucking when towing

6.7w0rkhors3 · Dec 1, 2017

Ive been having this issue for a while now. The truck has 87,000 miles and now is starting to buck violently when towing. I have a 5th wheel set up and a 3 car hauler.
It seems to do it on even a slight incline but only when rpms are low, if I smash the gas pedal is gone. Any idea you guys might have an idea what this could be? Thanks

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DockRocker · Dec 1, 2017

Sounds trailer related to me. Have you checked your hitch? Axle alignment?

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6.7w0rkhors3 · Dec 1, 2017

DockRocker said:
Sounds trailer related to me. Have you checked your hitch? Axle alignment?

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Not i have not but why would it happen and certain low rpm and only uphill. Also, it recently started happening.

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Dzchey21 · Dec 1, 2017

is the truck stock?

DO you have a way to monitor things like rail pressure?

6.7w0rkhors3 · Dec 2, 2017

Dzchey21 said:
is the truck stock?

DO you have a way to monitor things like rail pressure?

Is completely stock. No way of tracking anything nor do I know what to look for. I hope you can elaborate, im new to the big diesel world.

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ToddP · Dec 6, 2017

Torque converter is locking and unlocking at low speeds. I’be never had it happen on a stock truck but in some high power 6.4l tunes it would do when when towing a lite load. It would buck violently

6.7w0rkhors3 · Dec 6, 2017

ToddP said:
Torque converter is locking and unlocking at low speeds. I’be never had it happen on a stock truck but in some high power 6.4l tunes it would do when when towing a lite load. It would buck violently

So any idea how this could be fixed ?

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ToddP · Dec 6, 2017

When I had the issue on my 6.4 the advice I was given was to stop feathering in the throttle and be a little more aggressive. And it worked just had to drive it different than I usually do. But on a bone stock truck, I’d say it might be on its way out.