4x4 "engaged", but no power

[ralf]

I have a 98 ranger 4.0L. The 4x4 isn't working. I don't think its the vacuum hubs because I manually locked them (via a link on here) and something is spinning when the tires roll (I assume that means there locked). Also, the front drive shaft appears to be working turning so I don't think its the transfer case motor. The only thing I can think of is that something is wrong with the front differential which I know nothing about. When I turn the switch to 4hi or 4 lo the light comes on and I can hear it gear down, but there is no power to the front end. I just had transmission work doen and I'm wondering if there is something that got unhooked accidentally? What could I look for at the differential?

 

[ralf]

Also, when I have it in four low and shift there is a grinding in the front end center. Is there spindles that could have broken in there?

 

[TeamExploder]

The 98 ranger front differential doesn't have a Center Axle Disconnect does it? Grinding isn't ever a good thing to hear....and you say the grinding only takes place when your in 4low?

 

[Jspafford]

Still sounds like the hubs to me. Are you sure you have them locked correctly?

 

[ralf]

I took them apart and checked to make sure they were locked, that rod won't turn if its not engaged right? I have only heard the grinding in 4 lo.

 

[Jspafford]

You shouldn't hear griding at all. Can you spin the front driveshaft when in 2WD?

 

[ralf]

Not to sound stupid, but just crawl under and try rotating it ?(obviously turned off and in park)