Catastrophic 2-3 shift
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Tuned
Joined: Oct 2006
Posts: 453
Likes: 12
Catastrophic 2-3 shift
I experienced a 2-3 shift today that felt like my 5th wheel unhitched and landed on the truck.
The sensation and sound was sickening.
I just pulled out on the highway, 9500 lb 5th wheel in tow, tow haul on, moderate acceleration, when the 2-3 shift sounded and felt like a bomb went off. 2011 with 50k miles. Rather bizarre if you ask me.
I know the 2-3 shift is rather unique. Combines an upshift and down shift at the same time. I think at the moment it was shifting, I may have put my foot into it a bit more. Maybe the tranny got a little confused?
Not sure if I should head off to the dealer and have them check it out. Has been okay since.
It was quite frightening. Wife thought the trailer fell off.
Any thoughts, comments, experiences?
S
The sensation and sound was sickening.
I just pulled out on the highway, 9500 lb 5th wheel in tow, tow haul on, moderate acceleration, when the 2-3 shift sounded and felt like a bomb went off. 2011 with 50k miles. Rather bizarre if you ask me.
I know the 2-3 shift is rather unique. Combines an upshift and down shift at the same time. I think at the moment it was shifting, I may have put my foot into it a bit more. Maybe the tranny got a little confused?
Not sure if I should head off to the dealer and have them check it out. Has been okay since.
It was quite frightening. Wife thought the trailer fell off.
Any thoughts, comments, experiences?
S
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,734
Likes: 2,663
From: SE Florida
If it isn't doing it again I doubt the dealer is going to find anything.
Logistics Pro
Joined: Nov 2004
Posts: 4,795
Likes: 47
I've had it happen 3 or 4 times in my 2011, each time when doing normal acceleration from a parking lot onto a road (not towing). Hangs in 1 and then revs and slams into 2. Last time it did it was maybe a year ago. Have about 94,000 miles on it. Doesn't seem to have any lasting effects. Researched it awhile back and evidently it's not out if the ordinary.
Freshman User
Joined: Mar 2017
Posts: 42
Likes: 0
Have them scan for a wheel speed sensor code. My 2011 has done it twice. It hangs the RPM up high and then slams the next gear hard. I think the traction control may have sensed a wheel slip causing the traction control to activate and then releases and slams a gear. Now with that being said I know I didn't spin a tire so that's where the wheel speed sensor comes in, It may be dirty or just not functioning properly and I think can cause this proplem.
Mountain Pass
Joined: Feb 2016
Posts: 193
Likes: 10
Perhaps this may help you. https://www.ford-trucks.com/how-tos/...oo-hard-361579
My Brother has a 2011 F-350 with the 6.7 Powerstroke and he had the same issue. Dealer replaced the pressure control solenoid and it took care of the problem.
My Brother has a 2011 F-350 with the 6.7 Powerstroke and he had the same issue. Dealer replaced the pressure control solenoid and it took care of the problem.
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