* The 1985 frame is slightly wider than the 1980 frame. This is most noticeable in the front of the frame, where the 1985 frame is about 2 inches wider than the 1980 frame.
* The 1985 frame has a different shape than the 1980 frame. The 1985 frame is more squared-off, while the 1980 frame is more rounded.
* The 1985 frame has different mounting points than the 1980 frame. This means that some parts, such as the engine and transmission, will not bolt directly onto the 1985 frame without some modifications.
Overall, the 1985 and 1980 Toyota truck frames are very similar, but there are some key differences that make them not interchangeable.
