Car won't go
I'm still trying to recover from my lug bolts shearing off, when I discovered that my front passenger side CV boot was torn open. I had the axle assembly replaced today and as I was driving home from the shop after picking it up, I pressed on the gas and the engine just rev'ed, but the car wouldn't accelerate. This was after 5 minutes of normal driving and fortunately I was only 2 houses away from home and was able to coast into the driveway. Once stopped, I tried putting the car in reverse - nothing. I tried 1-4, and then D again, stopping and starting the engine, but the car won't move. I didn't hear anything unusual and I even had the A/C and radio off to listen for weird noises from the passenger wheel. I looked under the car and there are no obvious physical issues - nothing hanging down or visibly broken. The engine seems to be running fine and when I change gears, it does sound like the transmission is moving through the gears. Nothing unusual until I put it back into P at which point I hear a little bit of a rattling grinding kind of noise. Like what you'd hear during a mis shift on a manual, but not as bad - the sound tails off as the engine revs lower. The only thing I noticed under the car is that there was some kind of fluid on one of the exhaust manifolds that was burning off. That could have been grease from the mechanic's hand or something. Nothing was dripping.
The shop wants me to tow it back tonight so they can look at it in the morning.
What am I looking at here?