So were gonna do the trans fluid while we got this shop session going on. So I called GM, they said 50K KM (30 thousand mile) interval, that surprised me as I don't believe my dealership ever did the trans fluid.
The spec the local GM said is 75W85 GL4 which is different from the 75W90 I saw mentioned in this forum.
And lastly is there a drain plug or not? I tried reading some threads didn't seems there was a definitive answer. We are just assuming there isn't and removing the pan, but now is there a hidden pan bolt that requires removing the rubber boot or not? Any fast replies appreciated were doing this today.