Hey guys just bought an 05 titan se and after a week of driving started to hear dragging/ticking noise while moving. I took to nissan dealership and they said its the rear dif plus bad pinion seal 4300$. I drove home and it seemed to be louder I got home and checked rear diff fluid with pinkie and I couldnt feel any fluid so I filled it took about 28oz of oil. I guess my question is does this mean the rear dif is definitely shot or is there a chance it was just low on fluid? Also if I do need a read dif should I have it done by nissan the price seems ridiculous and I couldnt afford that especially just after making the purchase for the truck.::crying::