If you have a chain hook welded on your bucket, use a chain. Hook one end up to the bucket and have a helper walk down the line, wrap the chain once around the t-post and pull it to the side. All you usually need is hand tension on the chain and they will come right out. Wrap the chain near the top of the post and they won't get bent up. If the post is stubborn, you may have to wrap it a couple of times near the ground and tilt the bucket back. The post will most likely get bent up though. Make sure your helper ALWAYS stays off to the side and use at least a 10' chain. That way, if the chain slips or the t-post comes out to fast, they won't be in harms way. I've cleared more old fence lines using this method than I care to remember and I think I'm starting to sound like Harv.