Allthought I know to see If I can get the fill plug off before draining it, I dont know how much should be put in. Does it really make that much of a difference if I err on the side of overfilled? Is there a way to see how much should be in there?

Also what kind should I be using for a 76 300d?

Sorry for the hijack, but I just realized that the diff fluid is at least 10 years old....

~Nate