Would anyone happen to know if I can use a 63-66 pitman arm with a 67 A Body PS box. I'm assuming the 67-up pitman arm won't work with the 63-66 A Body.

The steering boxes interchange as the splines are the same. The large sector power box was introduced in A bodies in 1973 so any '72 or earlier steering box is game. Look up both cars on rockauto.com to see if the pitman arms interchange.

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Joshua