Transmission will not shift into any gears, including park

I was driving my truck that is listed above (HD) down the road when the truck started to slow down. I pressed the accelerator and the RPM's went up but the truck speed did not react. I pulled over and when I went to put the truck it park, it made a whining/grinding sound. I shut off the truck in neutral and towed it home. The truck will crank, and you can shift through the gears but it will not engage anything, it is like it is stuck in neutral. But when you shift into park, the shifter moves but it makes this whining/grinding sound and will not engage into park. While in park, if you rev up the engine, the whining and grinding react with the RPM's but nothing ever happens. Is this the torque converter that has gone out or something else? Also the four wheel drive will not engage. You can hear the solenoid actuating and clicking but it never locks in either. Fluids are good, and it was driving and shifting fine up until this point. There was no indication of any issues, it just quit.