My Dart Swinger Project!

Ok so I been looking at some manual boxes. So here is what I found. I found a couple used ones for not to much but the couple is outrageous over 100 bucks the gear itself is around 80 so I I'm in let's say 200. What's the deal with the pitman arm you was talking about? I'm not seeing a 73 and up gear I'm seeing like 64-76? Do the pitman arms have a different spine or something?

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