I bought a 2012 Wrangler 2 door in March. I found out quick 6th gear in the manual is a hold speed only, as long as your not going up any incline. I felt the slip or something. I'm assuming it was gear slip. But I'm not sure there is anything wrong with the tranny, it's more like maybe it kicks out when under demand. Is this normal? Not just 6th gear, happened in 4th and 5th at other times. Wondered if it was normal or should I take a deeper look at the tranny?