This is just a grill guard, not a full bumper. It's a Ranch Hand, if that changes anything.

It came off of an 06, my truck is an 04. Will it bolt up?

This is the style.

 

It doesn't look like it. The Ranch Hand GGF051BL1 guard on fits 2005-2007 trucks.

 

NO....
I had a very nice Grilleguard on my 2000 (same as your 04) that was almost new so i tried to mount it on my 2006 (Didn't Fit ) although the frame mounts are exactly the same the bumpers are a completely different height which wont allow the grilleguard to mount up.
If u remove your Bumper u can drive around with just the GrilleGuard on though

 

As mentioned, they will not fit. I did an 05+ front end on mine and therefore had to find a 2005-2007 brush guard.

Also, looks like they list 2 part numbers for those two body styles.

 

I think what is being said is current setup no. Sounds like a good reason to upgrade to an 05 front.

 

Naw, I'll keep the front end I've got. I like my white grill.

 

Who says you cant have both?