Carl ,
Take a look at Chevy of the 40's .
They have some pitman shaft seals .
Originally there's a Packing & a Retainer to seal the end
of the sector shaft .
Something like in this photo showing a sector shaft & packing & retainer .
PIC
https://i.postimg.cc/4dhYdkkR/Pitman-Shaft-NOS-3.jpgGo to ebay & in the search box type...............262156 pitman shaft
PIC
https://i.postimg.cc/wjmJMmhG/GM-262156.jpg&
https://i.postimg.cc/L5rygZs6/262156-b.jpgThat maybe the retainer you need . Check your parts manual .
If that's the retainer for your truck...........BUY IT..........super rare part .
I may have a source for the packing GM # 270289 if that's the
correct one for your truck .
George
'54 3600