Fairly big job, they drop the gearbox, drain oils from transfer case and g'box, take out the flywheel and have it machined, (make sure they do this as it is always good to start with a flat surface) and replace clutch , also make sure they replace the spiggot bearing. Most mechanics would allow for a whole day to do the job and charge about $800 in labour/machining/oils etc. Cheers