My Hilux going on 1 wheel. What could be the problem?

[BabyGodzillaGTi-R]

Hey guys,
drive a LN106 Hilux with a rear Lock Rite Installed.
Notice an odd problem where the car seems to be really twitchy on a straight road. Then it felt funny that it was so easy to wheel spin at the traffic lights.
And finally realised then the car seems to run on 1 wheel when i tried to drive up the lawn.

So what do u guys suspect is the problem? A broken axle? A broken Lock Rite? Coz it feels like the right side only recieves power.
I havent open it yet.
The funny bit is the car has not seen a single bit of offroad action when it was installed 10 years ago and probably done less than 25000km. Total mileage is 55000km.

If it's a broken lock rite what could it be?
I did a search everyone says the springs is a weak problem.

Anyway bottom line i'm from Malaysia. So is there anyone in here is a Lock Rite dealer/ specialist? At least i know where to source and order parts if necessary.
Sigh.

[MQ080]

A broken axle? ...The funny bit is the car has not seen a single bit of offroad action when it was installed 10 years ago and probably done less than 25000km. Total mileage is 55000km.

Bingo with the axle guess, it’s possible that there were stress fractures formed a while ago and a bit of pressure at the right time, snap! It's possible also that it could be a fairly clean break. If the locker wasn't in there you would have found out exactly when it happened because there would have been no drive at all.