What is "shift flare"? - Ford Powerstroke Diesel Forum
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Old 02-23-2013, 11:16 AM
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What is "shift flare"?

I see that term coming up once in a while. I'm running Matt's SRL and find that when it shifts into high at about 48 mph the cab noise gets quite bad and the motor seems to lug. Now is the noise coming from the tc locking up? Also I've read that sometimes the tranny goes from 4-6? Really?
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Old 02-23-2013, 11:28 AM
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Shift flare is when it gets ready to shift from one gear to another and it feels like it slips or goes into neutral for a split second. Usually most noticeable when shifting from 3rd gear.
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Old 02-23-2013, 11:32 AM
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Quote:
Originally Posted by dhanna6powerstroke View Post
Shift flare is when it gets ready to shift from one gear to another and it feels like it slips or goes into neutral for a split second. Usually most noticeable when shifting from 3rd gear.
thanks, I don't think I've experienced that symptom then. Sounds like it would be hard on parts in the tranny.
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Old 02-23-2013, 11:35 AM
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Originally Posted by Dene2006 View Post
thanks, I don't think I've experienced that symptom then. Sounds like it would be hard on parts in the tranny.
Yeah. Tuning has a lot to do with it and Matt is one of the best when it comes to trans. tuning.
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Old 02-23-2013, 12:02 PM
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The early lock-up in OD can be problematic with a load because the torque just isn't there when you need it. For an empty truck, it isn't much of an issue, the same for a race since it won't be in OD until at a much faster speed. The vibration is typical up to about 1700ish rpm, especially if you have parts that are rubbing on the cab or frame (exhaust) or harmonics from the exhaust.

One gear in the trans is only used when cold. So it is practically a 5 speed. Plus the TC slips as part of its design when cold and for smoother lock-up. Most flare is not really a big deal, unless it gets out of control or creates undue heat engaging under high power.
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Old 02-23-2013, 12:37 PM
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the srl locks the tc around 45 or so if you dont like it call lars at gearhead and he can adjust it for you and send a new tune
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