Trans shifting weird when warm
Thread Starter
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Joined: May 2004
Posts: 516
Likes: 1
From: Upstate NY
Trans shifting weird when warm
My truck has been shifting weird somedays when it warms up. It seems that it will not want to shift into OD, but when it does the RPMs will jump up a little then shift. Somedays it is fine others it does that. I have not checked to see if it has any codes stored. I can check this morning. I had the speed sensor replaced about a month ago due to ABS light on/off and shfting weird.
I have read on here before about cleaning valves or replacing them. Also I was thinking if I had to clean or replace the valves why not upgrade the valve body.
I have read on here before about cleaning valves or replacing them. Also I was thinking if I had to clean or replace the valves why not upgrade the valve body.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
That's called shift flare. The '99's had that problem. I think I remember a TSB that indicated a change to the software and a change to the valve body. Ford covered the cost when the truck was still in warranty.
Thread Starter
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______
Joined: May 2004
Posts: 516
Likes: 1
From: Upstate NY
Thanks Mark. Well I'm just a little out of warranty. So I guess I'll have to foot the bill. Can a trans shop do the upgrade to the software or only ford? If I went with an aftermarket valve body and installed it myself would that help more than stock?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
Most trans shops can't upgrade the software. Some may be able to do it. I don't know anything about aftermarket valve bodies.
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Post Fiend
Joined: Feb 2007
Posts: 7,191
Likes: 4
From: Blairsville,Ga
Jody can reflash your PCM to a later code
I just bought a chip from him that did about the same for my shifting problems
I just bought a chip from him that did about the same for my shifting problems
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Thread Starter
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______
Joined: May 2004
Posts: 516
Likes: 1
From: Upstate NY
My neighbor has a 2000 F-350, 7.3, auto and I replaced his speed sensor for him shortly after mine. He called me tonight and said his truck is now doing the same weird shifting, Also when we were comparing things, I realized that both of our trucks have been sticking in 3rd and holding in it longer than before shfting into OD. I believe his sensor came from NAPA and mine came from Federated Auto. Could it be a bad speed sensor?
