Chevy or GMC Rear Axle Identification

Dana 44 Beam Type Axles have 10 bolt covers that are approximately 10-3/8" high and 9-3/8" wide. For most applications, the bolt head size is 1/2" and the bolt thread is 5/16 USS coarse thread. Early covers (up to the mid 1970's) are made of thin steel...

Not all Dana axles have the model number cast on the housing. It can be very difficult to tell a Dana 60 from a Dana 70, as they have nearly identical covers with exactly the same bolt pattern. One way to tell if you have a Dana 60 or Dana 70 is...

Many Dana Axle have the model number cast somewhere on the cast iron differential housing.

Starting around 1965, Dana started using metal tags affixed to the differential cover by two of the cover bolts. Each tag has a Bill of Material Number (BOM) stamped on it and it is affixed to the axle before it is shipped from the factory. The photo...

All 1994-2002 Dana Rear Axles in Dodge Ram trucks have a Bill of Material Number (BOM) stamped on a Build Tag (red arrow) attached to the differential by two of the differential cover bolts (yellow arrows). The BOM number is a 6 digit number...