If the sound is gone....
...it was most likely a shot CV on the 1/2 shaft that was removed.
You are essentially a 3 wheel drive now...
..but I'm surprised the TOD appears to be working OK
I'm no expert on the TOD..but my best 'guess' would be the TOD lights
are working ok because the wheel with no 1/2 shaft is simply following the
rotation of the wheels in general..
..and not setting off the sensor by slipping or losing traction etc...
..... thats my wild guess anyway!
New 1/2 shafts are available from SurTrack... for about $50 ish.
These are good for normal road driving and light off road/farm track use.
But are no good for real off road stuff.
Here ya go :-
http://www.amazon.com/s/ref=nb_sb_no...ywords=IZ+8021
This is the 1/2 shaft..doesnt sound like you need the whole axle.
Hope that helps
jo