Transfer Case Rear Seal Leak
 

Hi everyone. I have a pretty simple question. 2001 dodge 2500 with Cummings and NP241DHD transfer case. I had a rear seal leak on the transfer case, so I replaced the seal. The seal lasted for a while, and then started seeping again. I am going to repair with a repair sleeve. I am guessing the repair sleeve goes over the driveshaft yoke where it slides into the transfer case. Does anyone have a part number for this repair sleeve? I have Napa, Oriellys, Advance, and Autozone in this area. I have seen them on the website but am confused about the one I need. I had one ordered in the past, but it was too small to slide onto the yoke. Thank You all for any information you can give me.