What do you guys think?

Ok so I went and educated myself as for the workings of the cone type sure grip that I have. I realize that the rear isnt going to be the cause of the lagging I have felt. However it does explain the occasional one tire fryer action. I thought it was supposed to be a full time "posi" not just a limited slip. My cones may be in need of machining soon. They seem to be ok for the time being, because if I really nail it they both light up no problem. Just seems to fry one tire in a slight turn.
Anyhow I finally eliminated (by education and your comments) that it may have been the rear.
So now Im on to figure out what can be happening in the trans. Ill start with the shifter linkage. Later guys and thx for your help.