I have a 2004 4x4 1500 QC and i want to replace the front end a with a ranch hand bull nose. Will this make my frame sag??

 

if it does, put a crank or two on the t-bar bolts...

 

k and how much of a weight difference do u think i will see

 

I was looking them up today, and how they look, it appears that it might be a little sag, but I don't imagine that you'll notice much of a difference, but it'll more than likely weigh 300-600 pounds. A friend of mine bought a Renegade grill guard, that weighed 300 pounds. So it can't be less than that, but you have less steel up top, but that added diamond plate down bottom should add up a couple hundred in weight.
When you get it on, be sure to take some pictures and post them up here. Interested to see how it looks.

 

Can't help you with the bumper, but I put on a the Ranch Hand brush guard and it lowered my truck about a 1/2 inch

 

When I installed my suspension lift, which in turn also leveled the truck, I did a couple of turns on the T-Bars as well, not much, just enough to raise the front an extra 1/2" or so over the rear in anticipation of installing a Warn Trans4mer and Winch. With the added weight, it's good and level right now, at least to the naked eye...