Yep, what Pete said, Lifted mine (King spring 2" lift) at about 10,000kms now has 75,000km of trouble free driving.
It would be interesting to know exactly how much higher the ARB kit made it as when I did mine because of the bull bar, winch, sliders etc. etc. extra weight it actually only lifter the suspension by 28mm. Not that I am worried by this but my point is if you do a bit of maths and figure out what the actual change in degrees to the output shaft of the transfer case after the lift I am sure you will find it will be a very minimal difference. Therefore ask LR to explain how on a vehicle that should be able to use its full travel of suspension (with no lift kit) can fail as soon as they put a new transfer case in and I am sure their test drive did not use the full limits of the suspension even if it is lifted???
Something seems a little odd here. It sounds more like ARB have reassembled something incorrect when putting your car back together and for some reason LR have not picked up on this when checking over it? I'd be asking LR to do a full check of how the front is assembled to see if they can see what has caused the fault so you can go back to ARB with something concrete that they will have a difficult time arguing as you can bet your bottom dollar they are going to argue!
Good Luck :)

