Do you have the in cab switch? Is the truck a CANBus system - as you will need to get the control modules altered to allow it to recognise the locking diff system and then control it if it is. The basic mechanical is fairly straight forward on these, no electronic brake calipers or any of that BS to worry about so it's just a case of securely supporting the arse of the ute off the ground so you can free anything holding the diff in place (driveshaft, brake drum, handbrake and balance lines, springs, shocks and any other links or ABS/TC wiring) and then rolling the new diff into place and refitting everything at the correct torque settings. Heavy bits to work with though.
Have a good look at the rear leaf springs for signs of wear or cracking while you have everything apart if you do it yourself. To be fair though, it is one of those jobs that I can do myself and have done in the past but now I tend to send the thing to someone - working on cars is just such a pain in the arse now as the engineers that design them hate normal people. I really dislike having to take the entire body off the subframe to get to the one bolt that isn't accessible and needs to be removed to allow you to replace your $20 part...
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