Sorry to re-open this thread after a few months, but I'm in a similar situation - used 2018 Suburban (bought with 96K miles on it) just came back from the shop after the torque converter shredded itself and shot metal through the transmission. Fortunately I'd purchased it with an extended warranty specifically because I'd seen issues at about 100K with transmissions, so the full replacement at the dealer was covered. What I don't know, though, is whether the new transmission (a rebuild) would have the lowered thermostat - driving home by a rather circuitous route (but no highway) I didn't see temp exceed 162F (and it's a 93F day). Any way to check this?
