5R110 shifting
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Trailering
Joined: Oct 2022
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5R110 shifting
I have a 2005 e350 super duty with the 5.4, and as far as I can tell, the 5r110 transmission. It shaving shifting issues and wanting to know some direction before I condemn the trans itself. What happens is it shifts 1-3 fine, then it will hold 3rd and keep revving up and not want to shift out of 3rd. Once I let off the gas, it will shift up into 5th, then when I hit the gas again it feels like there’s no power and instantly drops back down into either 3rd or 2nd and revs to the moon. So basically when you finally are able to get it to shift up, it kicks itself back down immediately, and you can’t hardly get above 45-50 mph. All of these gears I’m listing are what’s shown in forscan. I am a novice with forscan as well, so any other testing that can be done from there would be appreciated. Also, there have been no trans fault codes so far.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
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From: SE Florida
Are there any codes at all, not just trans codes? With what you are describing, there definitely should be codes set.
And yes, that is the 5R110W. A normal shift sequence is 1-2-3-5-6. If the trans is colder than 0°F, it will shift 1-2-3-4-6.
And yes, that is the 5R110W. A normal shift sequence is 1-2-3-5-6. If the trans is colder than 0°F, it will shift 1-2-3-4-6.
Last edited by Mark Kovalsky; Jan 28, 2026 at 01:17 PM.
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Trailering
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How fast the motor spins in park with the pedal to the floor
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Trailering
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Given the codes shown that I have, where would you think the issue would be? A failing fuel pump? My only issue with that being the cause is that according to forscan, the fuel pressure seems to be what it is calling for.
Mountain Pass
Joined: Dec 2025
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You would need to monitor fuel pressures when the issue happens... Usually it will be fine at idle but with load on the engine the fuel pressure will fall fast. Also monitor fuel rail pressure return voltage.. The voltage should go up and down slowly.. You can unplug the rail sensor and see if it drives better.. If it does, the sensor is giving incorrrect info to the pcm. If its something else like the fuel pump driver module or the fuel pump itself it will run worse...
Also, if a torqshift in any vehicle, isn't getting enough torque it won't shift.. You would not be the first person to think its a transmission issue...
Also, if a torqshift in any vehicle, isn't getting enough torque it won't shift.. You would not be the first person to think its a transmission issue...
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Cargo Master
Joined: Dec 2015
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I thought the E-series got the 4R75, esp with the 5.4?
Anyway, I'd start by looking at the FRP sensor and wiring. If these have a FPDM I'd also look at that for corrosion.
Anyway, I'd start by looking at the FRP sensor and wiring. If these have a FPDM I'd also look at that for corrosion.
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Mountain Pass
Joined: Dec 2025
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They came with either a 4r or a 5r depending on application... High input code mean the pcm is sending 5 volts to the sensor and the sensor is not changing the voltage so that the pcm can understand it.... Monitor your rail sensor return voltage and the rail pressure. Graph the return voltage. It should have no zigzags in the voltage...
Unplug the sensor and see if there is return voltage still. There should be zero return voltage.. If there is still return voltage that mean a short to power (This is rare). Unplugging the sensor will put the truck in default mode and it will still start and run but not great, IF everthing else is good. I get ones towed in a few times a year with an after market rail sensor on them causing random no start/stall, run rough issues.. Only use an oem sensor if yours is bad.
Unplug the sensor and see if there is return voltage still. There should be zero return voltage.. If there is still return voltage that mean a short to power (This is rare). Unplugging the sensor will put the truck in default mode and it will still start and run but not great, IF everthing else is good. I get ones towed in a few times a year with an after market rail sensor on them causing random no start/stall, run rough issues.. Only use an oem sensor if yours is bad.
Last edited by LEEDSnDeed; Jan 31, 2026 at 11:45 AM.
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