With the advent of the post of Defense Minister Dmitry Ustinov's support turbine tank has intensified. After eight years of work, require a large amount of research and dovodok, in July 1976 the result of joint work CLRI name Klimov, KB-3 Kirov factory and VNIITM called T-80 have adopted. The new tank has retained a degree of continuity, inherited from the T-64 transmission, automatic loader and a similar set of weapons, and the tower (on the first versions). Complete unification did not happen, as in the case of the T-72, based at the chassis of T-64 tank prototype 'object 219 sp.1' in the series did not go. When a significant change in the dynamic characteristics of the new tank chassis T-64 it is not satisfied in full, but instead of improving it was again decided to create a new chassis. Option tank with a new chassis "object 219 cn. 2 'and became the prototype of the T-80.