Buckshot - Thanks for catching what I clearly missed in my first response -
Jman - Here's more info on the center "tie rod" (not including the tie rod ends) and the "clamps" that are needed with appropriate bolts and nuts to secure the tie rod ends to the center tie rod bar.
Chevy Parts Group 6.230 - Rod, Front Axle Tie GM# 3683223 47-1/2" overall length, 1" - 16 thds Right Hand and Left Hand (female ends) *
* Also listed in GMC Master Parts Books as Group 1.0400
Chevy Parts Group 6.234 - Clamp, Tie Rod End GM# 3681858 (requires 2 each)** / ***
** The Chevy Master Parts Books do not list the bolt and nut info that are needed for the clamps, nor does an early 1950 GMC Master Parts Books list them.
*** A later GMC Master Parts Book list the hardware as Bolt - 7/16 - 20 X 2 with a corresponding 7/16 - 20 nut.
You can see the Chevy and GMC truck models/years that these pieces were used on in the screenshots below. Added in case you need to seek a donor truck for the parts.
I did do a quick web search and found nothing being offered for the main tie rod, but did find
One NOS GM# 3681858 Clamp being offered.
Hope this helps you get what you need for rebuilding your 6400 steering.
