New dif shudder/vibration?

[Racer-X]

Mark, I'm not thinking they are out of balance. I'm thinking I'm feeling the lugs on the tires. I went straight from 4 wheel parts (where I had tires put on) to the dealership maybe 15-20 miles away. I may not have noticed it in that times because all I could think about was how I was spewing dif fluid everywhere and waiting for it to totally go.

My buddy is telling me that if it's a dif issue I could drain the fluid within 200 miles or so and I would show metal in the fluid. Would you guys agree?

I can definately feel this both coming and going from a stop. Infact I can even hold it in the speed range (about 3-5 MPH) and maintain the vibration. My bro had a good idea - he said he gets the same vibe in his Ram after lifting and putting on MT's. He asked me to turn in that speed range and see if it gets worse - the idea being that you can feel the tires lugs much more if your in a turn. What do you guys think? Would turning also put more stress on the hubs causing increased vibration if it wasn't the tires?