Crank Pully ?

[cujo8]

My crankshaft pulley does not appear to be running true or is out-of-round. When the engine is running I can see a slight wobble of the crankshaft pulley. This wobble causes the AC belt tensioner to move up and down slightly as the engine is running. Yesterday I replaced the AC belt tensioner and belt, because the belt was original to the truck and the bearing in the AC belt tensioner had some play in it. I'm thinking that this crankshaft pulley wobble may have caused the AC tensioner to ware out prematurely. Any thoughts on this problem and anyone else have this issue with their crankshaft pulley? I would think it would be quite difficult to bend this pulley, since I believe it also the harmonic balancer as well and seams very solid.