POSI Question

[Ghazi67]

Hello ;

While doing the usual maintanace for rear end on my K15, I found out that it has a posi unit back there.
How often can I find such a unit on these trucks  ?
And are there any marks on diff case telling me that it is a posi piece ?

Thanks

[Captkaos]

There are generally numbers on the outer axle tube that will tell what the setup was, but sometimes you can't read them.  Generally the best place to look is the RPO code sheet in the glovebox.

Hard say a percentage on how many got them, but around here is it like 40/60 for the 4x4's.