Are you certain that yoy ahve a dana 44? Most Chevies from that era have the HO33 rear, not the dana. The dana was used mainly in GMC. If you do have a 44, here's a site that might help. http://www.ring-pinion.com/PartsList.aspx?SearchMode=Diff&TypeID=3&Type=Dana+Spicer&DiffID=15&DiffName=Dana+Spicer+D44&CatID=10&CatName=Rings+%26+Pinions&CatType=Sub-Differential
