There is a brake in period where the gears are going to ware themselves into each other. There will be some metal shavings that will be inside of the diff housing. IDK what your hearing, or how loud the noise is. If all is in spec, it does take some time for the gears to set in place. I'm not saying that you don't have an issue, IDK if you do or not. Also the torque drag on the pinion bearing preload will be or will feel different when the tires are on the truck. I didn't use a crush sleeve. I used a crush sleeve eliminator kit. I am so glad I did. My front seal leaked, and I had to replace it. Using the eliminator kit, I didn't have to worry about messing up the pinion preload. Once it's set, that's is. There is no changing it. I will say this and it may help, IDK. Once the pinion preload is set, the next thing, is the carrier back lash. If you pull the cover, pull the tires off and the drive shaft off, and recheck all of your settings. If you don't have an inch pounds torque wrench for the pinion preload, you need one.