My summit finally blew an outer wheel bearing and it was completely shredded, most of it was dangling on the driveline. When I was taking it apart I noticed that one axle carrier has what appears to be a bigger size bearing on the inside of it, closest to the driveline. Is it a bearing or something else, also, is it suppose to be there because only one axle carrier has it in there. And I cant seem to be able to pull the carrier off the driveline to replace that mystery part as well, because it is also in pieces. I got the truck off ebay so I don't know what its been through before me. Any help would be GREATLY appreciated.