What causes flare on the 1-2 shift in c6?

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What causes flare on the 1-2 shift in c6?

Post  rocketpony on September 4th 2017, 11:25 am

my c6 tranny is revving up between the 1-2 shift, what cause this? Is it jus band or clutches too?
Thanks

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Re: What causes flare on the 1-2 shift in c6?

Post  Frank Merkl on September 4th 2017, 2:38 pm

bands wore
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slip 1-2

Post  ED468 on September 9th 2017, 10:15 pm

I've seen blown Servo seals too.

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Re: What causes flare on the 1-2 shift in c6?

Post  Gregaust on September 10th 2017, 1:26 am

Do you know the history on this ? fresh build ? Old ? Could be as mentioned band worn or could be the moulded servo piston rock hard and leaking

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Re: What causes flare on the 1-2 shift in c6?

Post  Frank Merkl on September 13th 2017, 1:02 am

actually should never flair on the 1-2 shift as the sprag is holding until the band takes hold
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Re: What causes flare on the 1-2 shift in c6?

Post  DanH on September 24th 2017, 4:17 am

How can the sprag (what Ford called an overuning clutch) hold 2nd gear? The band must be applied for 2nd or. 1st and 2nd would both be on at the same time

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Re: What causes flare on the 1-2 shift in c6?

Post  Frank Merkl on September 24th 2017, 1:39 pm

the sprag holds until the band stops the direct drum ,them it overruns
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Re: What causes flare on the 1-2 shift in c6?

Post  DanH on September 29th 2017, 2:03 am

Till it stops the drum. The band can can let the rpm flare up for a few reasons

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Re: What causes flare on the 1-2 shift in c6?

Post  rmcomprandy on September 29th 2017, 9:03 am

rocketpony wrote:my c6 tranny is revving up between the 1-2 shift, what cause this? Is it jus band or clutches too?
Thanks

Something in the system which controls the second speed band or the band itself.

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Re: What causes flare on the 1-2 shift in c6?

Post  colorado ford man on October 7th 2017, 6:17 pm

The cause is too much power, or atleast more power than the shift can hold. Happens pretty often in my stuff. You can firm up that 1-2 shift by stacking pennies in the accumulator as well as some spacers in the modulator valve. This will firm up the 2 shift a lot, so long as the servois holding and the band is good. If the slipping was measurable at all, that band probably burned and a snap band might be in order.

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