My 1992 Rodeo needs a Diff, HELP!!!!!

Hey guys, Im searching for a Diff for my 1992 Rodeo, my mechanic tell me I will need it soon. Question, Do any of you know why it is that my Rodeo has a four
wheel drive light in the dash that is always lit, but no lever shift or switch to turn it off??? I recently purchased the car and I think Im only using two wheels, not sure, how can I tell??? And, finally, Im looking for a web-site that sells parts for my Rodeo.
My respect to all you Isuzu Drivers, Garth
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Site Timeline is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.