Thanks liveoak for the info. I wonder if toyota elocker are designed differently, to not have that flaw when switching from drive to reverse. Something to put into consideration.
ARB is probably not an option for me since I had issue with them on both my rig and know other rig with arb in toyota and dana axle that leaks.
Probably will still prefer a 9.5 LC F&R harrop elocker over a toyota 8" elocker F&R. truck will not a dedicated crawler, but will see a fair share of rock. I wouldn't mind the factory LC rear locker for both F&R but too hard to find and price sitting between 800 to 1000 buck, might as well go harrop.