My mate has this LR. Permanent 4x4 with no diff locks.

Just used as a plaything on trails.

So seeing that it has no diff locks, he is considering putting in manual lockers similar to what the old hilux SFA's have.

Will this work? If so, how would he confirm which lockers to consider seeing that he did not build the vehicle himself and has no idea what diffs it has...

Would it be possible to put the same type of manual lockers on the back diff?

All advice would be appreciated.