Gents, I bit the bullet on this 2020 1500 and decided to do the trans filter and fluid service at home after watching 1 really good video on youtube and one that was just okay.
Jacked her up took off front wheels, safety stands etc pulled fender liners, out Pulled a few heat shields off, popped 3 02 sensors out, left passenger downstream one in place as lead is long enough.
Cussed a few hundred times trying to get inside passenger manifold bolt out, and got exhaust dropped so I could access and drop pan and fluid.
All went well, til I started getting things cleaned up before reassembly, as I emptied my waste oil into some jugs I had laying around for this task, I filled one to 4 qts exactly and another one I put 24 ounces into.
That is all that came out of it, I have owned it since new, (26 miles) and it has never leaked a drop, nor has anyone ever touched the trans for service etc, I had 2 services done at the dealer both long ago like around the 10k mark on the odo.
Never any issue wityh shifting etc, other than typical slow assed GM shifts.
Everywhere I read says it takes 8.1 qts for this service, tomorrow I will follow all procedures and get it up to temp etc and fill her up but tonight I am questioning WTF?
Other than roll with it after the fill up what do you think?