Transmission Slipping

[AirJordan613]

Recently purchased this ‘09 Tahoe with the 6.2. About 140k miles on it. Trans started slipping after having the fluid flushed and filter changed (OE fluid and filter at Chevy dealership). Seems to only be slipping under WOT, otherwise it seems to behave pretty normally. Does this look toast?

 

[swathdiver]

Have you seen this before Randy? @randeez @BlackBearPerf

Should he run the Service Learn Adapts?

 

[Bill 1960]

I would drive that very gently back to the dealer and have them hook up a scanner and drive it. Could be just a malfunction in a control circuit (electronic or hydraulic) caused by some debris that was dislodged during the flush.

Could be it’s toast. What was the initial reason you took it in and had the flush/change done?

 

[AirJordan613]

Reason was that I didn’t see any records of transmission service, so I figured that I should. Also had some weeping trans cooler lines and those were replaced.

 

[alpha_omega]

The sound heard other than the engine, was that your swinging keys striking the dash as you accelerated?

 

[AirJordan613]

Yes, just the keys

 

[AmunRoo]

Hey, I'm new here and I'm kind of having the same issue you are. I experienced the same type of problem when going WOT. Everyone other than that, normal City driving causes no issues whatsoever. I'm considering changing my fluids but not a flush. I have an 07 Denali with the 6.2 AWD

 

[Foggy]

Exactly the reason I don't recommend "flushing" the trans...
If the fluid is that bad, it's prob toast... If the fluid is that bad, drop the pan
and replace fluid --- then do it again in just a couple thousand miles..

 

[swathdiver]

@iamdub @Doubeleive @mikeyss @gooffeyguy

Have you guys taken a look at this yet?

 

[Doubeleive]

def an issue, I have no input other than it's in the range of where the torque converter starts to go, probably needs a deeper look, have pan dropped and check for metal/inspection
could it be a relearn issue? not sure when mine was relearning it did some weird shifts but not that bad