I asked the earlier question in regards to the a/c system..because trying to do the work myself, basically a weekend warrior. Now just so i can understand, Are the drier, evaporator, and expansion valve, and condenser all the same on both a 77 and 81 300D??? Since I went from the 77 engine to the 81 engine? Since i want to replace the r-4 compressor with a new one, and everything being the same all i would need is the a/c suction hose from behind compressor to the expansion valve. Is that correct? I would also replace the drier and expansion valve

Thanks you