I’m debating what to do about my 2006 buick Rainier awd 4.2 with the 4L60E transmission. Truck has 192k original eng. & Trans. Both eng. & trans. Are running well and I feel like the engine could go another 190k. I’ve seen a few of these tranny’s go 160 to 190k then need a rebuild. I installed an oversized pan with drain plug around 50k & have changed out 5-6 quarts max life atf every 25k or so. Probably 80% hwy miles since new. Anyone seen these units go 250k+