I've been running a PowerTrax rear locker for the last 5 years now and it's finally starting to give up. On the last rear diff fluid change there were some fragments of the internal springs from the locker stuck in the sludge on the drain plug. UhOh!!! I jacked up the rear of the truck by the center diff so both rear wheels were off the ground and spun the left rear. Sometimes both rear wheels would spin in the same direction, sometimes I could 'feel' it unlocking and then only one wheel would spin. NOT normal behavior.
I checked in with my financial advisor (aka the wife
) and later this month I'm going to have Jim at Inchworm Gear set up the rear-end with an ARB RD-129 unit. Not only do I off-road but I tow a 5,600 lb travel trailer, so being able to tow with the locker disengaged will be better for me in the long run.
If you can swing it, go with an ARB.
Oh, yeah you'll need to have an on-board air supply as well.