4R100 shift flare - Ford Powerstroke Diesel Forum
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Old 04-03-2010, 11:36 PM
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4R100 shift flare

The truck had the shift flare occasionally since i bought it, 3 months later my tranny went up. i had it rebuilt, upgraded most of it, didnt replace the valve body but did get a shift kit. After getting the truck back, it still had the shift flare. Took it to a trans shop and they replaced the solenoid pack and reflashed the pcm. After that, the shift flare wasnt as bad but still there for about 3 weeks and now its real bad.

The only fix i can find when searching is the new solenoid pack and reflash. what else should i replace or look at? Its driving me nuts.

eary 99 7.3
213,000 miles
rebuilt trans
new solenoid pack and reflash
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Old 04-04-2010, 08:29 PM
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Ok something new happen today, i was on the highway for about an hour. Got off at my exit and came to a stop. When i tried to go, rpms went up slowly and truck hardly moved. Almost like i was trying to go from a dead stop in 3rd gear. i hurried up and put in 1st and it accelerated fine.

Since this has happened, it hasn't gone away. Still have the shift flare and i have to manually put it in 1st if i come to a dead stop. After driving an hour back home i got a flashing OD light. still no check engine light though.
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Old 04-05-2010, 02:57 PM
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Oboy..nother local rebuild failer..
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Old 04-05-2010, 10:10 PM
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Is this the kind of intelligent answers you get on this forum? That was quick assumption. If this is true, how about you explain to me what the builder did wrong?

The problem im having, was before i even pulled the tranny to get rebuilt.

The new problem im having was 1000 miles after i had aamco put the revised solenoid pack in and reflash. (which is fords fix to the shift flare on there TSB)

Last edited by SideSwipe; 04-05-2010 at 10:18 PM.
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Old 04-05-2010, 10:14 PM
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But any way i took it back to aamco today to check the codes, it had a few. All tranny codes (a couple Solenoid ones). Didnt get a chance to write them down but im going to drop it off tomorrow to see what the problem is.
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Old 04-07-2010, 10:21 AM
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What is a shift flare? I'm having tranny issues and nobody can seem to help me.
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Old 04-12-2010, 06:31 PM
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Quote:
Originally Posted by SideSwipe View Post
Is this the kind of intelligent answers you get on this forum? That was quick assumption. If this is true, how about you explain to me what the builder did wrong?

The problem im having, was before i even pulled the tranny to get rebuilt.

The new problem im having was 1000 miles after i had aamco put the revised solenoid pack in and reflash. (which is fords fix to the shift flare on there TSB)
I know you are ticked, I was too the first two times, the third time i just laughed. unfortunately these trannies are hydraulic, the solenoid pack controls sequence and shift timing to a certain degree. the other guy was probably right, somewhere your rebuild went wrong. if you are not getting any movement when placed in drive then your tranny is suffering from internal part failure. the solenoids are almost never the problem. did they replace torque converter?
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Old 04-13-2010, 01:04 PM
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With the failure to down shift to first you certainly have some sort of failure. The flare could have been a symptom or the cause. How much of a flare are you talking about? 100-200 rpms like the torque converter unlocking?
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