Power box

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Yes, and Yes if it is the early box before 1972 ? I think the change was 1972-73 to the larger sector shaft for the pitman arm.
 
Yes in 1973+, all the bodies changed to the larger sector shaft one, which was always used in the C-bodies (at least my 1965). The shaft diameters have been posted many times, so search. Might we ask why you care if you have a 1963 already? Another change was the direction (up or down) which the tie-rod studs pointed. I recall it was upward until 1967, so if yours is thus you can be assured you have the early box & Pitman arm, indeed must be since 1967+ cars had a wider body and thus different steering cross-linkage, but verify by googling images.
 
Easiest way to tell is the size of hex nut under pitman arm. If a 1&1/8 socket fits, its the smaller shaft. If you need a 1&5/16 socket for that nut, its the larger shaft.
You can't use the larger shaft box in your early A. The pitman arm that fits both the larger shaft and your center link was never produced. The 67 through 72 owner would have to change pitman arm, center link, and idler arm to 73 up design. If my memory serves, the center link of first generation and second generation A-bodies are not interchangeable. If thats correct there is no way to use a larger shaft steering gear in a early A.
So with the correct steering gear... check that foot of gearbox and mounting pad of K member are clean and flat. Put some locktite on those 3 bolts and evenly torque them. Early Chryslers had issues there. The bolts would loosen, then the nuts welded inside the K would break loose.
Chrysler changed to bolts with special tighter fitting threads while they funded development of a thread locker product. Those 3 special bolts are offered in Parts For Sale section from time to time.
 
Easiest way to tell is the size of hex nut under pitman arm. If a 1&1/8 socket fits, its the smaller shaft. If you need a 1&5/16 socket for that nut, its the larger shaft.
You can't use the larger shaft box in your early A. The pitman arm that fits both the larger shaft and your center link was never produced. The 67 through 72 owner would have to change pitman arm, center link, and idler arm to 73 up design. If my memory serves, the center link of first generation and second generation A-bodies are not interchangeable. If thats correct there is no way to use a larger shaft steering gear in a early A.
So with the correct steering gear... check that foot of gearbox and mounting pad of K member are clean and flat. Put some locktite on those 3 bolts and evenly torque them. Early Chryslers had issues there. The bolts would loosen, then the nuts welded inside the K would break loose.
Chrysler changed to bolts with special tighter fitting threads while they funded development of a thread locker product. Those 3 special bolts are offered in Parts For Sale section from time to time.
Thanks for the info ,I.just got my hands on a good power box and pitman arm you were very helpful.
 
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