2nd to 3rd Flare

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I have been battling a 2nd to 3rd gear flare (slip) with my C4. I solved the majority of my problem by blocking the dual ported red stripe modulator's small port, which resulted in a complete elimination of the flare after truck was run a mile of two. I still had the flare for the first mile or so, but shifted great thereafter all day.

I attempted to eliminate the "cold flare" by retorqueing the valve body, given that I did not used torque wrench the first time, readjusting the forward band to 1 /3/4 and switching out the dual ported red stripe modulator to a green stripe modulator. The result was cold flare and flare all the time. I switched back to the red stripe modulator with the small port plugged, given that I am not running an egr, and, although I have no flare when truck is warm, the cold flare still exist.

Any ideas for next steps to eliminate cold flare from 2nd to 3rd?

Thanks for any help.

Rob

 

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Looks like I found the fix

Thanks for all your detailed responses. Oh, wait a minute, no one actually responded. I'm just kidding, but it appears I fixed my flare problem and thought I should provide an update for those that might have a similar problem.

Initially, I plugged the small port on my red stripe modulator, which helped remove the 2nd/3rd flare when the engine was warm, but I still had a flare when engine was cold. After retorqueing valve body, adjusting bands, changing modulator from red to green stripe then back to red stripe, I remembered a post saying to leave the small port open to ambient air. I figured I'd try it before going to a complete rebuild and it worked! No flare in cold or hot conditions when going from 2nd to 3rd gear.

I will keep testing to make sure it holds up, but I think I've got it.

 

[Broncmeister]

well I for one thank you, I've had 2 to 3 shift flare for a long time and have never been able to figure it out. I am going to try your method, thanks.