As prev posted Patrols do not have a centre diff and the Patrol Rear LSD is the best around bar none.
If your rear diff is in good cond then e-locker front is the way to go IMHO.
If you want the ability to lock both front and rear then I would probably go air.
In my last 4 Patrols I have gone for a mechanical locker 'cause I don't have the need for 'flick the switch' lockers.
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