1970 DUSTER 440 4spd 8 3/4 posi

the 73 steering box was a large sector shaft box. therefore, the 73 pitman PROBABLY wont fit the 70 box. no gaurentee though. i am running the 73 steering on my 70 kframe with no problems whatsoever. large sector box, 73 pinman, idler, and centerlink. the main difference IIRC is that the V8 centerlink ahs more of a drop than the /6.
best you can do on the pitman is to just try it. you may get lucky.
hope that helps.

michael