on the way to work this morning it felt like the transmission was sliping during a gear change, i was in drive not sport. maybe between the 3rd and 4th shift? not really sure.

put it into manual and banged a few gears perfectly.

note....i have the intense level1 tune so the trans tune is modified. i dont want to take it to the dealer just yet. im just wondering if this could get worse or if it was a fluke? it seemed to slip for about a second or 2 and then went right away as if it couldnt make up its mind. (think of a slipping clutch).

should i get ready to put the tune back to stock before going to the dealer?

Old-school me would say check the fluid level... :slap:

Don't know Waltah. Now that the trans has its own computer, I'm lost as to even an uneducated guess. Swap back in your stock tune if you can and see what happens.

i dont even think we can check trans fluid level on these things, arent they sealed?

I would see if you could get it to slip again. If its slips randomly its the trans, flash it back to stock and take it in. If it only slips at one specific speed it may be a tuning issue. try and go the same speed and give it the same throttle input as before to try and replicate the problem.

i dont even think we can check trans fluid level on these things, arent they sealed?
Yes, and that's why I included the little "slap" winkie.

Slapping myself...

Nevermind. :o

you can check the fluid level, but its not fun. requires a level lift and getting the trans up to operating temp, and maybe even have the car in gear while taking the filler cap off, then you basically fill until it overflows. oh the joys of "sealed" transmissions. they just do it to save a few bucks, and so you have to go to the dealer to get your fluid changed, because it becomes a PITA job.

I know this has been a while, but there is a tsb on a 2-3 flare do a search if you haven't found a solution...

I am having the exact same problem on my 2-3 shift at high RPM. It's really bad. I put everything back to stock and going to the dealer Monday. I've had my ECM/TCM updated right after the new engine was put in but I think Mike accidentally overwrote it :)

I'll find out Monday when they look at it.

What's weird is it was working great for the first couple thousand miles...went to the track and it felt great. I noticed it last week when I returned to the track and it flared every time on the 2-3 shift. My 1-2 shift worked great.

from what i read on the tsb it was more noticeable at part throttle

is it under part throttle or full throttle? could just be a flare..

here is what I'm referring to

Flare And/Or Harsh 2-3 Shifts - keywords bump delay second slip third - (Nov 19, 2008
#PIP4395C: Flare And/Or Harsh 2-3 Shifts - keywords bump delay second slip third - (Nov 19, 2008)


Subject: Flare and Or Harsh 2-3 Shifts


Models: 2007-2009 Cadillac Escalade, Escalade ESV, Escalade EXT

2007-2009 Cadillac SRX, STS, XLR

2006-2009 Cadillac STS-V (http://www.g8board.com/forums/showthread.php?t=8253&highlight=flare#), XLR-V

2009 Chevrolet (http://www.g8board.com/forums/showthread.php?t=8253&highlight=flare#) Avalanche, Tahoe

2008-2009 Chevrolet, Suburban

2006-2009 Chevrolet Corvette

2007-2009 Chevrolet Silverado

2007-2009 GMC Sierra

2007-2009 GMC Yukon Denali, Yukon XL Denali (http://www.g8board.com/forums/showthread.php?t=8253&highlight=flare#)

2009 GMC Yukon

2008-2009 GMC Yukon XL

2008-2009 Hummer H2

2008-2009 Pontiac G8

Equipped with 6L80 (RPO MYC) or 6L90 (RPO MYD) Automatic Transmission




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This PI was superseded to add to the DO NOT replace list. Please discard PIP4395B.


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The following diagnosis might be helpful if the vehicle (http://www.g8board.com/forums/showthread.php?t=8253&highlight=flare#) exhibits the symptom(s) described in this PI.

Condition/Concern:
Some customers may comment on a flare or harsh 2-3 shift.

Recommendation/Instructions:
This condition may be caused by leaking 1-2-3-4 and 3-5-R clutch fluid seal rings (230 in SI document 1698360). The following conditions are indications that the fluid seal rings may be leaking:

• Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts, that are more likely to occur when the transmission temperature is below approximately 40 degree C (104 degree F).


• Harsh or flaring 2-3 shifts that are more likely to occur when the transmission fluid temperature is in the approximately 0 degree C (32 degree F) to 40 degree C (104 degree F) temperature range, but can be present at any temperature.


• Harsh 2-3 shifts that are more likely to occur at less than 50% tp.


Vehicles built in the January through August, 2007 time frame are more likely to have leaking fluid seal rings

Important: When inspecting the 1-2-3-4 and 3-5-R clutch fluid seal rings (230) there probably will not be visible signs that the seal rings are damaged.

If any of the conditions above describe the flare/harsh 2-3 shift condition replace the 1-2-3-4 and 3-5-R clutch fluid seal rings (230).

DO NOT replace the valve body, TCM or fluid pump cover assembly.

Important Note: The 1-2-3-4 and 3-5-R clutch fluid seal rings (230) must be properly oriented when they are installed. Incorrect installation could lead to fluid leakage and shift concerns. Refer to SI document 2178811 for installation directions.

Please follow this diagnostic or repair (http://www.g8board.com/forums/showthread.php?t=8253&highlight=flare#) process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

I have been experiencing this as well lately. I may try to unplug the battery so the tcm can reset since I have been tweaking my shift points lately. maybe it needs to relearn from scratch.

Funny thing is, after I do a WOT run, banging through the first 3 gears in sport...the thing shifts perfect and SMOOTH like a cadillac in every gear until I shut it off and drive it cold again. I may start a thread on this to see if anyone else sees this "drives smooth after hauling ass" scenario.

otherwise trans is great though. these trans are so finicky its ridiculous. too many variables and tables and parameters for it to use to make a shift decision. and its constantly learning on top of it all

I have the exact same issue if you read the PIP above it states that exact scenario when cold or below 104* tranny fluid temp it happens the most.

I noticed mine a couple days ago and now that the weather is cooling down I notice it more. Hoping to take mine in to get fixed at the dealer gotta wait to make sure my buddy can sneak it in w/o anyone noticing the headers and cam :)

try to reset the trans adapt program if you have HP tuners. me and a couple of others on here have done that and it corrects the flare. i guess when you tweak the trans tune it needs to have the adapt programs reset or it uses the old tunes parameters to learn/adapt from. and your shifts may start flaring

mine isn't a tune issue and is going in to have some trans work done... clutch fluid seal rings for me.

are you positive cause i was going to take mine in when i saw the tsb but this fixed my problem. is your trans tuned? do you have HP?

I've had two different tunes over the last year vector and then livernois.

It only started acting up recently (within the last couple of weeks) and is getting slightly worse as time goes on. Its NOT a tune issue.

i dont know i would still try resetting the trans adapts. i almost took mine in for these seals then saw this and tried it and it fixed it. especially since youve had multiple tunes. you dont want the clowns at the dealership tearing apart your trans already if its unecessary

I'm having the same problems and I haven't had a tune. I reset my computer when I installed the Vararam and it acted differently for a while. But, other than that, the symptoms listed are exactly what I'm experiencing. The colder the temps, the more noticeable the problem. Something to note, though, is that if you garage your car, the tranny doesn't cool as fast. If I let my car sit for two days or more, the problem is much more noticeable and it takes longer for it to fully warm up and go away. I've also noticed (or think) that driving in hilly terrain gets the tranny hotter which hides the symptoms better and keeps them hidden. I would think that racing/WOT runs would also heat the tranny more and hide the symptoms as well.

Mine just started this yesterday. Feels like it's reving a few hundred rpms before it shifts. I'll just add this to the list of problems.

on the way to work this morning it felt like the transmission was sliping during a gear change, i was in drive not sport. maybe between the 3rd and 4th shift? not really sure.

put it into manual and banged a few gears perfectly.

note....i have the intense level1 tune so the trans tune is modified. i dont want to take it to the dealer just yet. im just wondering if this could get worse or if it was a fluke? it seemed to slip for about a second or 2 and then went right away as if it couldnt make up its mind. (think of a slipping clutch).

should i get ready to put the tune back to stock before going to the dealer?


Welcome to the club, really sucks. reflash the stock tune if you can and take back to the dealer, don't take no for an answer and get it fixed. A little tranny problem can lead to very big one's. I'm about to start my own war with GM and their piece of **** transmission.

i doubt the dealership will repair anything in the tranny other then the valve body, or the torque converter. dealerships are not usually trained to do full trans rebuilds or even internal work on them. usually a dealership will just order a new tranny or remanufacuted one from gm

all they are replacing is the clutch fluid seal rings according to the pip/tsb

I got a new tranny thanks to this problem, car was in the shop over a month

I have started to experience this, but I think is from 1-2 and only if i am driving slow from a stop and after 1 or 2 seconds of softly pushing the pedal, then I push the petal to the metal, it just chokes and takes a while to find the gear. But I push the petal to the metal fro m the stop, it wont happend, only if Ik am geggining to roll out softly out of a stop n thenn push it all the way.

Not sure what can be causing it, but I am going to put my stock tuen and test and see...

Any of you had experience it like this?

if any of you guys have been tweaking your trans tunes make sure to reset the trans adapt and fast adapts. it fixed flaring for me and some others. if you dont reset it its like it uses the old tune to adapt to or parts of it.

Hey mike, do you remeber what table in HP Tuners you do this?

if any of you guys have been tweaking your trans tunes make sure to reset the trans adapt and fast adapts. it fixed flaring for me and some others. if you dont reset it its like it uses the old tune to adapt to or parts of it.

Hey mike, do you remeber what table in HP Tuners you do this?

in the vcm scanner theres a button that says on off 100% or vcm controls if you hold the arrow over. under trans tab

I have the flare/hard shift on the 2-3 shift, but it seemed to appear only after my custom tune and ONLY in manual shifting mode, it really lets you aggressively bang the gear right at redline but it doesn't seem to catch as well or as smoothly as it does on all the other shifts including the 1-2/


For me it only happens when I'm really high in the rev range and only when I'm flooring it, in other words I can adapt my driving behavior and prevent it from occurring if need be...basically an earlier shift into 3 or letting off the throttle a bit on the shift

In D the car is fine everytime all the time.

I was going to bring it back to the tune shop and see if they can rectify the issue there before bringing it to the dealer as it seems like it may be a programming/timing thing as much as a leaking seal or mechanical flaw. I'll try this route first especially since my car was fine previously and I had 25,000 miles when I got it tuned...one would think the problem would have surfaced before then.

My transmission is flaring from 2 -3rd. I have contacted the tuner to see when I can get the stock tune back to confirm it's the transmission.

Im starting to wonder if its a tune thing...has anyone without a tune had the same issue?

if you have it at WOT in high end i think that may be the seals. if you have it during regualr low rpm daily driving depending on how you accelerate that the tune needing to be reset

anyone able to test if this was the tunes or not yet? All I know is my car is waaay less fun without the tune.

if you have it at WOT in high end i think that may be the seals. if you have it during regualr low rpm daily driving depending on how you accelerate that the tune needing to be reset


I thought that may be the case but something happened today that now makes me 99% sure its just my tune and nothing else...will confirm friday when I get it back to the tune shop, but what has changed my mind is the following:

in D I floor the car and go from 0-80 TC off and each shift is firm but smooth and there is no hesitation and no jerkiness

in Manual mode I do the same WOT type run and I get a very firm but still positive 1-2 shift banging it at 6500 rpm or so and then the 2-3 shift at the same rpm I get that slamming hard shift and it just didn't feel right - every other shift is smooth

in S mode I again do the same thing 1-2 shift hard but smooth then on the 2-3 shift @ WOT (TC off) on pavement that is only ever so slightly damp the car fishtails as it bangs 3rd and then hooks back up again...if this was an issue of the tranny slipping or flaring I would get the same jerky feeling but power would be lost at the wheels some and the revs would climb, my feeling is that I just have way too much (like maybe zero) torque management tuned out in manual and sport modes.

any opinions?