Formally called the Chevrolet C/K, C/K is a series of trucks manufactured by General Motors and marketed under the Chevrolet and GMC brands. The C/K line includes pickup trucks, medium-duty, and heavy trucks.
is there a question here? probably a 700R4 .It can be identified by the pan which is close to square and has 16 bolts however there are variants of it in the 4L60, 4L60E which are used in newer years and look similar and can is most cases be used