According to my Land Rover guy, you should jack it up. Engage diff lock and gear, then try spinning the wheel. If it turns then that's the one that has gone.
well i went to fit the replacement drive flanges last night...
undid the first 4 bolts but the last ones threads had been stripped (another job to have to sort!) there was no oil in the diff either
ok, so then i cleaned up the drive shaft splines but could i buggery get the drive flange fully on, got it on 90% but then just would not seat, despite repeated battering with a mallet and block of wood. It got dark then and I lost interest
will whip out the drive shaft tonight and see whats what with it, i suspect I might have missed a bit of metal in a spline or something.
Halfshafts seem to be made out of harder metal than drive flanges in my experience. So it's the splines in the flanges that tend to wear rather than the ones on the shafts. Some flanges just slip onto the shafts and others need persuading with a hammer. It's just the machining and wear burrs I think, because I find that even tight ones are slack after a few hundred miles, so it's probably only a few high spots fouling.
managed to get them on, cleaned up the splines on the shaft a bit and got the "persuader" out.. bit of running up and down and they go on fine now
however...
went to bolt them on and the outer diameter of the inner flange is 80mm whilst the oem one is 78mm and it these fancy heavy duty ones wont go on properly! Theres always something isnt there
temporarily stole an oem one off the spare 110 in the garden so at least its back on the road