Big Bad Allis
Full Access Member
Update: finally got the Tahoe back with 653 MI after their test drive. Service advisor gave us a warning before handing the keys over. He said that the one two shift is going to be really hard for a little while, until everything settles, and the trans "relearns" how to shift again. I found that a bit odd, so I asked him why. he stated because it's a brand new electronic valve body and the transmission was completely flushed of fluid and refilled with "better" fluid. He said he was told by the troubleshooters that it is normal. Not sure I completely agree with that because we got the car with 20 miles on it, and it ran just fine, until it didn't. [emoji2363]
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There will be some "relearning" but that is normal for most modern vehicles. The "learning" is based somewhat on the type of driving the driver does. It's a balance of driver input through the ECM and transmission control electronics. Not sure that technical names for all electronics involved. It will adjust the shift points. This should not really be noticeable in most cases.
I call BS on adding a "better Fluid". I would ask what the "better Fluid" is. As a lubricant engineer and owner of an oil analysis laboratory, I wold love to know what their idea of "better fluid" is.