Its a 2014 silverado 5.3 2wd lt, i started noticing a weird hard shift from 2-3 and 3-2 around 100k while i was still under warranty i took it in a few times for service but they told me it was normal and just gave me the run around till my warranty expired, the truck has 140k now as i travel alot (56hr round trip into mexico) every year.