See Mike Swann's reply, for your interest:
Thank you for the inquiry.
As a Nissan owner myself I do know a fair amount about the diffs used as well as the most cost effective traction control options on offer .
So here we go.
Aussie Locker Nothing available
Lokka. More than likely but won't supply me 'cause as the sole Aussie Locker Iistributor for Africa and India they feel that there's a conflict of interests.
Lockright. Definitely but are a little scarce 'cause of low production volumes hence the price increment.
I prefer the A/L because of really stringent quality control although I was the first person to introduce Lockright into S.A. in 1993.
All of the above use the same basic design principles patented by John Zentmeyer so it all boils down to warranty back up and to a lesser extent price.
Any locker is going to lock both wheels together in the same axle thus imparting 50% power to each wheel in effect strengthening the axle making up to 9 times stronger than a conventional open diff as all the side gear teeth mesh with the cam gear's at once.
Pushed really hard the CV's will break and then the hub locks but you'll never break a ratchet style locker especially one made by A/L in the USA.
As you eliminate wheel slippage in a cross axle obstacle for eg the axle/diff is effectively that much stronger as previously discussed.
Power goes to the wheel on the ground, directly opposite to an open differential as you well know. Both wheels turn at the same speed regardless of axle position relative to the terrain you're traversing.
There's a 2 year warranty with most of the ratchet style lockers and in the event of a locker failure you can revert to an open diff by simply replacing the damaged locker with the OE g/set.
Let me see what I can do about getting you a quote which will take a couple of working days.
Please visit my website www.difflocks4africa.co.za
for further discussions on traction control options