The c to c spacing on my 79 c20 is 42 1/2,The 79 K 20 has the same spacing. It is my understanding that the 67-72 with leaf have the same spacing ,with the exception of the 4X4,& the longhorn which are 40" c to c. the 73 up 1tons also have the 40" spacing. The shock mounts are different on the 73 up trucks,& will requier welding in that area. as for the frames,the longhorn is 34" across,& my 79 is slightly wider(1/8-3/16)....I would have to check for sure.....69 longhorn.
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