Loose front end..help

alrite my 94 s10 is bag'd..stock c-arms..2in drop spindles..etc. my passenger side has started to make a popping noise when i hit bumps...i jacked up my front end and noticed that there's about 1/2in or so play when i pull on my wheel from front to back..none up and down...if i pull hard enough i can make it make da noise...also when it was sittin' on the ground i could roll the truck back and forth with the parkin' brake on and it'd pop....any idea's?? i gotta go to a show this weekend and needa get it fixed so i dont hafta roll in my stocker....

The 1/2 inch play in the front wheels is steering. could be inner, outter tie rodends. idler arm or pitman arm. Jack up the truck under the lower control arm and shack the wheel like you were doing front to back. get someone else to look at the drag link and inner and outter tierod ends while you shack it. if you know what your looking for then you can figure out the rest. if not then take it to a local alignment shop and tell fix it. im not sure whats the deal with the truck moving while the parkin brake is on but that it needs to be tightened up.  

i really appreciate the help...i'm gonna make sure to get it to a shop tomorrow....would the tir rods..etc...make a kinda loud poppin' noise like that?    and i meant rolling the truck in gear..not the parking brake lol