The BMW E12 is an automobile which was produced by BMW from 1972 to 1981. It was the first generation of the BMW 5 Series mid-size sedans.
The differential of E12 comes from older and larger E3 and E9, Bavaria and coupe. LSD occurs very rarely, sometimes in the first E24 635CSi. Definitely very interesting with his side cover(sideloader diff). Everything is made of cast iron.
33 years later together with a fifth series F10 diff: