My rpm goes to 7 and I am barely moving

Just replaced the transmission hose so not it. The oil is full and under hood is clean and where it is sitti,g no oil leakage under auto

OK ... BUT .. Did you check the *transmission fluid* level?? .. You were over-revving the engine to a (dangerous) 7,000 rpm but the vehicle was barely moving,, that is a 'very good' sign the transmission is slipping! .. That oily residue on your "back glass" had to come from somewhere! .. The smoke you saw from the rear was more than likely leaking fluid hitting the hot exhaust .. Look underneath at the chassis and I bet you'll see signs of leakage .. If all the fluid has leaked out while driving, then you won't see any leaking out onto the ground cause it ain't none left to leak ... I hope the transmission can be salvaged .. Again, Good luck with it!