Trans shift quirk
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Fleet Mechanic
Joined: Aug 2013
Posts: 1,691
Likes: 2
From: Fallon NV
Trans shift quirk
When driving it will shift from 2 or 3 I don't remember to the next gear and for a split second down shift and then back up. like it was at the shift point and it cant make up its mind. Happens only when I'm speeding up at a slower pace. If I am on it then nothing happens. I had to much ATF in the trans and drained it down but no change. It does not happen every time but I can make it happen.
I have the 6.0 cooler on it and it has a chip. I have not turned it off to see if it changes anything. Fluid is clean and I have a filter in the system.
I have the 6.0 cooler on it and it has a chip. I have not turned it off to see if it changes anything. Fluid is clean and I have a filter in the system.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
It could be the chip, it could also be the torque converter unlocking and relocking during the shift. About the time your truck was built there was some problem with the unlock/relock. It's mostly a problem in the programming. It won't hurt it, but I agree that it's annoying.
Mountain Pass
Joined: Feb 2014
Posts: 180
Likes: 2
Originally Posted by Mark Kovalsky
It could be the chip, it could also be the torque converter unlocking and relocking during the shift. About the time your truck was built there was some problem with the unlock/relock. It's mostly a problem in the programming. It won't hurt it, but I agree that it's annoying.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
I believe I have the same problem but from 3 to 4th gear. It's shifts, RPMs go down, then back up, then down. I thought it was a slip issue but I just got it rebuilt. The owner of the shop was out today so I haven't got to talk to him. His helper acknowledged it but felt it was the computer telling it to shift that way. Is this he same issue?
Hotshot
Joined: Dec 2005
Posts: 14,375
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From: evansville in
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Mountain Pass
Joined: Feb 2014
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More Turbo
Joined: May 2012
Posts: 542
Likes: 1
From: New Milford, CT
A good transmission shop should be able to take that truck for a test drive and override the computer that controls the shifting effectively manually shifting the truck with something they'd plug in.
That'll determine whether it's an internal transmission issue or an issue with the truck telling it when to shift.
That'll determine whether it's an internal transmission issue or an issue with the truck telling it when to shift.
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