Another transmission problem
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Another transmission problem
I was reading cattlerancher's post ,but my problem is a little different from his.
I have a 2008 Ford Lariat F150 with 53k miles. The transmission seems like it slips at times. Here's the scenario. When I take off from a standstill and going through the gears at a normal acceleration pace, say I momentarily lighten the acceleration pace then try to resume. At that point, the transmission seems to slip momentarily, then bumps back into the pull mode. It feels like there is slack in the drivetrain until it re-engages, or like the lockup torque converter momentarily releases until the computer has time to react to the accelerator positioner calling for more. One guy said the transmission is, at that point, between two gears... either trying to decide to downshift or to upshift, but you can feel the surge in rpm momentarily until it “decides” ...then bump and your off and running again. If I push the O/D button, it stops doing it. Anyone know what I can do? Because the dealer can't seem to get it to act up when they test drive it. It does it fairly regularly on me though.
I have a 2008 Ford Lariat F150 with 53k miles. The transmission seems like it slips at times. Here's the scenario. When I take off from a standstill and going through the gears at a normal acceleration pace, say I momentarily lighten the acceleration pace then try to resume. At that point, the transmission seems to slip momentarily, then bumps back into the pull mode. It feels like there is slack in the drivetrain until it re-engages, or like the lockup torque converter momentarily releases until the computer has time to react to the accelerator positioner calling for more. One guy said the transmission is, at that point, between two gears... either trying to decide to downshift or to upshift, but you can feel the surge in rpm momentarily until it “decides” ...then bump and your off and running again. If I push the O/D button, it stops doing it. Anyone know what I can do? Because the dealer can't seem to get it to act up when they test drive it. It does it fairly regularly on me though.
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Joined: Aug 2002
Posts: 6,104
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From: Southern California
I was reading cattlerancher's post ,but my problem is a little different from his.
I have a 2008 Ford Lariat F150 with 53k miles. The transmission seems like it slips at times. Here's the scenario. When I take off from a standstill and going through the gears at a normal acceleration pace, say I momentarily lighten the acceleration pace then try to resume. At that point, the transmission seems to slip momentarily, then bumps back into the pull mode. It feels like there is slack in the drivetrain until it re-engages, or like the lockup torque converter momentarily releases until the computer has time to react to the accelerator positioner calling for more. One guy said the transmission is, at that point, between two gears... either trying to decide to downshift or to upshift, but you can feel the surge in rpm momentarily until it “decides” ...then bump and your off and running again. If I push the O/D button, it stops doing it. Anyone know what I can do? Because the dealer can't seem to get it to act up when they test drive it. It does it fairly regularly on me though.
I have a 2008 Ford Lariat F150 with 53k miles. The transmission seems like it slips at times. Here's the scenario. When I take off from a standstill and going through the gears at a normal acceleration pace, say I momentarily lighten the acceleration pace then try to resume. At that point, the transmission seems to slip momentarily, then bumps back into the pull mode. It feels like there is slack in the drivetrain until it re-engages, or like the lockup torque converter momentarily releases until the computer has time to react to the accelerator positioner calling for more. One guy said the transmission is, at that point, between two gears... either trying to decide to downshift or to upshift, but you can feel the surge in rpm momentarily until it “decides” ...then bump and your off and running again. If I push the O/D button, it stops doing it. Anyone know what I can do? Because the dealer can't seem to get it to act up when they test drive it. It does it fairly regularly on me though.
Lead Driver
Joined: Jul 2007
Posts: 7,868
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From: Rhode Island
No, you are not supposed to lock OD out when traveling under 40....You're only supposed to lock OD out when it starts hunting between 3rd and 4th while towing or hauling a heavy load.
It's probably IS momentarily unlocking the the converter, then locking back up. Canceling O/D probably keeps the converter locked up longer. Another possibility is that it's in 3rd, and shifting into 4th when you let off the pedal, then back into 3rd once you get back on. Automatics typically unlock converters between shifts, and when you let off the gas.
It's probably IS momentarily unlocking the the converter, then locking back up. Canceling O/D probably keeps the converter locked up longer. Another possibility is that it's in 3rd, and shifting into 4th when you let off the pedal, then back into 3rd once you get back on. Automatics typically unlock converters between shifts, and when you let off the gas.
Moderator
Joined: Aug 2002
Posts: 6,104
Likes: 384
From: Southern California
No, you are not supposed to lock OD out when traveling under 40....You're only supposed to lock OD out when it starts hunting between 3rd and 4th while towing or hauling a heavy load.
It's probably IS momentarily unlocking the the converter, then locking back up. Canceling O/D probably keeps the converter locked up longer. Another possibility is that it's in 3rd, and shifting into 4th when you let off the pedal, then back into 3rd once you get back on. Automatics typically unlock converters between shifts, and when you let off the gas.
It's probably IS momentarily unlocking the the converter, then locking back up. Canceling O/D probably keeps the converter locked up longer. Another possibility is that it's in 3rd, and shifting into 4th when you let off the pedal, then back into 3rd once you get back on. Automatics typically unlock converters between shifts, and when you let off the gas.
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Here's what the manual says:
Drive is activated when the transmission control switch is pressed.
• This position allows for all forward gears except overdrive.
• O/D OFF lamp is illuminated.
• Provides engine braking.
• Use when driving conditions cause excessive shifting from O/D to
other gears. Examples: city traffic, hilly terrain, heavy loads, trailer
towing and when engine braking is required.
No where does it say to lock out OD under 40. Only IF you get excessive hunting between OD and 3rd.
Drive is activated when the transmission control switch is pressed.
• This position allows for all forward gears except overdrive.
• O/D OFF lamp is illuminated.
• Provides engine braking.
• Use when driving conditions cause excessive shifting from O/D to
other gears. Examples: city traffic, hilly terrain, heavy loads, trailer
towing and when engine braking is required.
No where does it say to lock out OD under 40. Only IF you get excessive hunting between OD and 3rd.
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