I have tried ARB Air F/R Lockers before on my 04LC 1HDFTE and 2012 Hilux 1KDFTV before, no complaints at all. It has its own maintenance trade offs. I recently ordered this though:
View attachment 2816703
www.harrop.com.au
I haven’t installed it, have yet to meet with a local gear tech shop here that does specialty jobs like this. But the electricals are all lined up now.
It’s an electronic activated locking differential. The ARB (air) and this are similar, but not quite and definitely have their own differences especially on the engagement process. There’s a lot of videos on how Harrop E-locker behaves differently from the popular Air Locker. I chose this for the the basic principle of simplicity (I already have an air compressor for air up/down) that won’t require air source and line. But don’t take my word for it, read user feedbacks and watch the videos and you’ll see if this sings to you, maybe no maybe yes. Good luck and enjoy the build.