I just picked up my car from the shop just now,i got ford motorsport 4.10's and rebuilt my trac-lock while i was at it. As soon as i backed up i heard some small noises that sounded like marbles hitting each other in liquid sorta.The when i went forward it was gone,i noticed after that when i turned slow the noise came back.Is this normal cause they aren;'t broken in yet?. Just trying to make sure nothing is wrong. Kinda sound like minor grinding i guess. I was going to take my car on the highway at 60 mph later on for 20 mins or so to see if i break them in.I haven't hit the gas har at all btw. I drove soo slow on the way home,acutually i drove 40 mph but i hardly pressed the gas. The car hardly has first gear now and second,so the gear changed pretty quick,i did get the speedo gear changed as well if anybody was wondering.So whats the verdict?is this noise normal at first?