I was just getting my 1979 F250 4x4 truck back on the road. I stopped using it around 2004 and decided to try to get everything working again, instead of sending it to the boneyard. Got it running, and changed out the rear differential this past weekend. The old one was trashed when the rear cover hooked a rock and all the lube ran out. Didn't notice it until it was already trashed. Bought a replacement diff at the time but never installed it. I hope to have it ready before the snow flies so I can once again push snow with it.