John, great article. This is going to be a big help, thank you. Question, how do I find the part numbers for the pinion seal and packing? I wasn't able to find anything listed for my 1954 3600. I did find and SKF Seal 25970 and National Felt Seal 5M89 listed for the Eaton HO52 in a 1969 C20 Chevy. Will those part numbers fit? Note, I asked for help on this in the Driveline forum and then reread this Tech Tip so I thought I'd ask you. Thanks.
