truck tries popping into 4wd
 

i just had my wheel bearing replaced and i think the guy that did it forgot how to put it together or sumthing. truck has the autolock hubs. now i can be driving down the rad and it feels like it trying to kick into 4wd. ill hear a clicking in the front end. itll stop if i wiggle the 4wd shifter a lil what do you guys think the problem is?