Had the 3/5/R fail at 72k. Was about 8 months over on warranty yet still within miles. Called GM and after some finger crossing and praying ended up only having to pay half of the repair... $1400 out the door. Turns out that the dealer wanted to simply replace the tranny but GM told them to open it up and inspect. Turns out my AMAZING wife noticed the trouble as soon as it started slipping, called me and stopped driving it. Since the wave plate was only cracked and not shattered it did not grenade the entire tranny. They did a full rebuild and flush along with a 12k warranty. Very pleased about how GM stepped up and helped even though I do not get my vehicles serviced at the dealer (from a long line of auto mechanics and normally service myself). If you notice ANY flare (sudden rise in RPM between gears) stop driving and have someone take a look. It will save you $.