Ok I have a 2003 F250 powerstroke.. when i lock the hubs in 4x4 i have a grinding sound coming from the driver side front wheel also the driver side hub is hard to turn from free to lock.... but dosent do it in 2wd only hear a pop every now and then when i turn to left any ideas

 

You probably have a locking hub going out.

 

ya i have had a few other people say that thanks for the reply back so im gonna try that should i go back stock or go with warn lock

 

Well, a stock hub is like $200+ for one... Warns are $200 for both. I went with Warns.