I'd recommend re-lubing the hub with axle grease and checking both the axle stub and hub to make sure the splines mesh completely.

If it looks fine, and the lube doesn't help, I'd warrantee both hubs. Warn stands behind their products. If its user abuse like Gary, then you should be expected to buy new ones. <img src="/forums/images/graemlins/drunk.gif" alt="" />

Just a dumb question, but when you did the install, did you cap off the vacuum line under the hood? Could be that the vacuum line is still trying to activate the hub.

Logansportage <img src="/forums/images/graemlins/patriot.gif" alt="" />