oldieoldie,
Tis called a "drag link".

A search of the 1929-57 Chevy Master Parts and Accessories Catalog
Steering Drag Link (the part description list begins on the previous page) shows Part# 3696469 applies to your 1952 6400 (Utility Truck).
Have included a screenshot pic below to help point out the correct item.
If your interested, do a web search for that GM# (you will find ones currently available for sale - 1 on eBay now and also from Chevy's of the 40's).
Good luck on your search for a replacement!
