The ranger front axle/differential is not different from Explorer.
All 4wd/awd 95-01 Explorer and v6 98-11 Rangers use a dana 35 SLA front differential (and some mercury mountaineers, and Explorer sport and sport trac 01-04) SLA stands for "short long arm" which is the type of torsion sprung IFS suspension these ranger based vehicles use.
With only a couple of exceptions:
The 95-96 V6 explorer was outfitted with a CAD (center axle disconnect)
The 98-99 Ranger had power vacuum hubs
The 95-96 explorer CAD is cool but will not clear the 5.0 oil pan without "massaging" or a drop bracket lift
The 98-99 Ranger PVH are problematic. Vacuum powered hubs usually are as it is hard to get vacuum to seal in a rotating wheel bearing.
Regardless there are NO SELECTABLE LOCKERS for the dana 35 SLA front diff, NONE NADA ZIP
No Eaton, No ARB, no OX, No Auburn, Nothing! Have your Auburn gear guy check again.......98+ ranger, 95+ explorer dana 35 SLA front diff.... totally different from the earlier reverse rotation TTB front diff and totally different from any Jeep dana 35 rear axle.
The way the CV axle fits the differential is odd, so NOBODY makes a selectable locker for us.
If there were you would not need hubs as you can lock and unlock the lower at will.
Adding the 98-99 ranger PVH hub system to an explorer is totally possible. Not something I would do but it is possible.
You would need 98-99 Ranger CV axles, wheel bearings and knuckles, along with the hubs and vacuum feeds. How you activate the vacuum to the hubs is up to you.
Then there is the aftermarket, the aftermarket mile marker or rough country made a cheap plastic hub for the 98-99 Ranger.... they are made to replace your power vacuum hub with a manual locking hub. Problem is they are not very good...they break EASILY. Not worth the $200+ it takes to buy a set, they barely work on a Ranger let alone a 4 door explorer that weighs double what a Ranger does..........
Anytime I build a 98-99 Ranger the first thing to go in the trash is the PVH system.... we ALWAYS replace this with a 2000+ ranger or Explorer cv axle, wheel bearing setup removing the hub system completely..........as I said the PVH hub system was problematic and weak, Ford ditched it in 2000 and so did I......