Very curious!
Thread Starter
5 Year Member
Joined: Feb 2016
Posts: 951
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From: Western Washington
Very curious!
I've been having the clunking and slight jerking during downshift on my truck... the 5-4 downshift and especially the 3-2 downshift as I'm coming to a stop at a light or something. It's a 2015 screw, 4x4 with the 2.7 eco. It was built 10/2015.
My question is, what is involved in the TSB to resolve the hard downshifting problem? What exactly does it change? I know it's basically a software change, but how does that software change resolve the issue?
I had two 1991 F150's and another 1993 F150 that would do all kinds of hard shifting, both up and down, sometimes so hard it would bang into gear and the truck would give a mighty jerk. I took one of them to the dealer, and they said they could easily solve that issue by doing a software upgrade. I asked what that would change, and they said it reduces line pressure during deceleration. I was not in favor of that, so I passed. Granted those are trucks almost from a different era and the E4OD was a completely different transmission, but that's an example.
So does anyone know what exactly the TSB software update changes? Does it reduce line pressure, or introduce slight delays in clutch engage and disengagement? Does it change shift points to avoid the transmission trying to shift during awkward rpm or vehicle speed ranges? How exactly does it address the hard shifting issue?
My question is, what is involved in the TSB to resolve the hard downshifting problem? What exactly does it change? I know it's basically a software change, but how does that software change resolve the issue?
I had two 1991 F150's and another 1993 F150 that would do all kinds of hard shifting, both up and down, sometimes so hard it would bang into gear and the truck would give a mighty jerk. I took one of them to the dealer, and they said they could easily solve that issue by doing a software upgrade. I asked what that would change, and they said it reduces line pressure during deceleration. I was not in favor of that, so I passed. Granted those are trucks almost from a different era and the E4OD was a completely different transmission, but that's an example.
So does anyone know what exactly the TSB software update changes? Does it reduce line pressure, or introduce slight delays in clutch engage and disengagement? Does it change shift points to avoid the transmission trying to shift during awkward rpm or vehicle speed ranges? How exactly does it address the hard shifting issue?
5 Year Member
Joined: Jul 2015
Posts: 5,684
Likes: 1,286
From: SE Michigain
I've been having the clunking and slight jerking during downshift on my truck... the 5-4 downshift and especially the 3-2 downshift as I'm coming to a stop at a light or something. It's a 2015 screw, 4x4 with the 2.7 eco. It was built 10/2015.
My question is, what is involved in the TSB to resolve the hard downshifting problem? What exactly does it change? I know it's basically a software change, but how does that software change resolve the issue?
I had two 1991 F150's and another 1993 F150 that would do all kinds of hard shifting, both up and down, sometimes so hard it would bang into gear and the truck would give a mighty jerk. I took one of them to the dealer, and they said they could easily solve that issue by doing a software upgrade. I asked what that would change, and they said it reduces line pressure during deceleration. I was not in favor of that, so I passed. Granted those are trucks almost from a different era and the E4OD was a completely different transmission, but that's an example.
So does anyone know what exactly the TSB software update changes? Does it reduce line pressure, or introduce slight delays in clutch engage and disengagement? Does it change shift points to avoid the transmission trying to shift during awkward rpm or vehicle speed ranges? How exactly does it address the hard shifting issue?
My question is, what is involved in the TSB to resolve the hard downshifting problem? What exactly does it change? I know it's basically a software change, but how does that software change resolve the issue?
I had two 1991 F150's and another 1993 F150 that would do all kinds of hard shifting, both up and down, sometimes so hard it would bang into gear and the truck would give a mighty jerk. I took one of them to the dealer, and they said they could easily solve that issue by doing a software upgrade. I asked what that would change, and they said it reduces line pressure during deceleration. I was not in favor of that, so I passed. Granted those are trucks almost from a different era and the E4OD was a completely different transmission, but that's an example.
So does anyone know what exactly the TSB software update changes? Does it reduce line pressure, or introduce slight delays in clutch engage and disengagement? Does it change shift points to avoid the transmission trying to shift during awkward rpm or vehicle speed ranges? How exactly does it address the hard shifting issue?