Thanks for the info. I also found a rebuild thread on the part. I will try that first.I don't remember where I saw it, but I once read that a Kia Sorento uses the same pump. I think there was a fairly long list of other vehicles that also use the same pump. Had to go that route when my LJ caught fire and both pumps burnt up.
I just did a quick google, looks kinda stupid expensive - I don't remember paying nearly that much, but seems to be available from a variety of sources. This is the cheapest of the three I clicked on:
Actuator Air Pump with Bracket, Also referred to as Air Pump, Vacuum Pump, Differential Lock up pump, Axle Locker, Differential Carrier Pump #51033 in Picture Diagram. FITS KIA Sorento 03 - 09, Kia Borrego, Kia Mohave, KIA BONGO 3 (BONGO III).www.ebay.com
Probably worth conducting a little google fu to find the other vehicles that also use it and see if it's more affordable with a different marque.
They are out there though.