A Dana Spicer rear end is an axle assembly manufactured by Dana Spicer and used in a variety of rear- and four-wheel-drive vehicles. A Dana Spicer rear end is designated by a number such as a Dana 44 or Dana 60. The higher the Dana number, the larger the axle.
Dana Spicer rear ends consist of axle shafts, a ring and pinion, carrier, and various bearings and seals. Those components are housed within the axle housing itself. A Dana Spicer housing can be identified by the presence of a bill of materials number that is etched into the housing. The bill of materials typically contains the word Dana and a six- or seven-digit number that identifies the unique components and designation of the axle.