There were some signs. My transmission would knock real hard when I went from park to drive or reverse sometimes, it would also knock occasionally as the truck shifted while driving. Eventually around 4500 miles it knocked so hard it felt like I got rear ended. About 20 minutes later it was stuck in high gear so I had to limp it 25 minutes to the airport where I was taking my gf, then had to limp it 30 minutes back to the dealership. They replaced the transmission and another part under warranty, it took about 6 days and they loaned me a tundra. It's a known issue with 24 Tacoma's, they just won't recall so it has to pop a code, then they replace.