[FlukeSS]

Originally Posted by Joshinator99

Usually a triple flush and new torque converter fix that issue. One day job.

AND get the correct transmission fluid.

The issue was caused by the wrong viscosity on the OEM transmission fluid used.

[ctrlz]

This thread includes info from GM management on what to expect from this problem-- basically flush ASAP and hope for the best, otherwise you need a new TC.
Also, some info on the fluid chemistry.
The fluid is hygroscopic. The retained water causes burnishing of the TC clutch.
https://bobistheoilguy.com/forums/th...issues.303084/

[arpad_m]

Originally Posted by Candie

The TC was replaced in April of 2024. After taking to a mechanic friend I learned this morning that when they replaced the TC the dealership put in the old Dexron-VI fluid. How does that happened 4 years after the updated TSB. I have since called the service manager and raised holy hell. I am hoping that the correct fluid will fix my issue.

Aww crap, that's the culprit right there. So sorry to hear that

The potential silver lining, though, is that if the service manager is an upstanding person, he should give you a new TC free of charge, and then you won't need to pay for a tune, you can just make sure they use the correct (Mobil1 Synthetic LV) fluid and the trans should be fine going forward.

[SomeGeoffGuy]

Originally Posted by arpad_m

Aww crap, that's the culprit right there. So sorry to hear that

The potential silver lining, though, is that if the service manager is an upstanding person, he should give you a new TC free of charge, and then you won't need to pay for a tune, you can just make sure they use the correct (Mobil1 Synthetic LV) fluid and the trans should be fine going forward.

Yea, don't they give you lifetime warranty on AC Delco service parts installed by the dealer?

-Geoff