I just purchased the gears and the guy who will do the install recommends replacing the carrier bolts (bolt the ring gear to the carrier in the differential). Of course, the bolts are discontinued by Nissan, so I am trying to get the specs for the bolt (again can't get it from Nissan) so I can get new bolts. He will leave my bearings as the car has only 65K (unless he finds a bad one). Did whoever did your install mention anything about replacing the carrier bolts. MArk Leader tells me that the bolts should be fine to reuse - but this guy I am going to is pretty adamant about replacing them - just looking for other opinions.