if it is the * 3/4 diff with the drop out front carrier , you need to remove the brake drums , undo the 5 bolts that holt the axle retainer , slide out the axles , drop the driveshaft & undo the 10 bolts holding the carrier & remove it with a jack , it is heavy , reverse the proceedure , & reset the axle end play , there is a threaded collar on the right axle you want to tighten it until there ios .008 -.018 end play