Jman - Welcome to Stovebolt!
Going to presume your "6400" is an AD Series truck, but it would help to know the specific year as it sometimes can make a difference on parts. A quick check of a 1929-57 Chevy Master Parts Book shows the tie rod ends for your 6400 should be:
Left - GM# 609747 (Modern replacements listed as ES142L amongst other part numbers)
Right - GM# 609748 (Modern replacements listed as ES142R amongst other part numbers)
A quick web search shows many NOS Left and Right Tie Rod End assemblies available at various price points. Here's just 2 reasonably priced NOS units that I found being advertised on eBay:
NOS GM# 609747NOS GM# 609748If you'd rather pursue newer replacements, here are a couple from the same supplier:
Tie Rod End 462.ES142LTie Rod End 462.ES142RThe new replacements are more expensive, but haven't sat on a shelf for decades and have the rubber boots that are almost always missing from the NOS GM pieces.
