IOTL, after the Korean War, Mao considered reverse engineering Soviet supplied IS-2 and place them into production as the Type 122 Medium Tank, the proposal was cancelled in favor of the Type 59, a Chinese copy of the T-54. WI, after the Cninese-Soviet split, Mao orders the plan to go ahead giving the PRC it's own production heavy tank? The "new" Type 60 Heavy Tank enters PRC service in 1964. It faces of against Soviet IS-2 and IS-3 in the 1969 border clashes. With the improvement in relations with the west in the late '70s, a modernize version is placed in production resulting in the Type 81 Heavy Tank with the 122mm gun replaced by a British 120mm L11 gun. Not only does the new tank have updated electronics like the Type 79, the ammunition storage is increase by 25% to 35.