What do you think you're getting for Jeffers other than prospects? Why don't you want prospects that might help in the future?
What prospects are redundant?
I'm on @Vanimal46 team all the way. Trade Ryan, Jeffers, Martin, Wallner, Bell. If you can't get anything for Martin and Wallner stash them both in AAA for now. I'm ok if they trade Larnach, or keep him if they 100 percent will bring him back next year. I'm not trading Clemens or Gomez, though if someone makes a ridiculous offer for either.....