The Jiefang Truck (解放).
From the series Car construction hanging charts (Qiche gouzao guatu - 汽车构造挂图), 29 sheets.

The slogan at the top:
Go all out, aim high and achieve greater, faster, better and more economical results in building socialism
(Gu zu ganjing, lizhengshangyou, duo kuai hao sheng di jianshe shehui zhuyì - 鼓足干劲，力争上游，多快好省地建设社会主义)