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I think I have posted here couple times on this topic in the past already.
I have actually upgraded my 2012 LR4 with the original brand new landrover locking rear diff. For that I sourced:
1) rear e-diff
2)HD rear drive shafts (not a must)
3) ECU
4)used harness from RRS or LR3/LR4 with a locker.
5)IIDtool to update the CCF
6) 5 hours on the hoist at the local LR dealership
Everything except the infortainment works as expected.
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