Here is the rod for a 1940-54 truck,
https://www.chevsofthe40s.com/detai...od_Rod_Only_Fits_4054_12_and_34_Ton.html 43-5/8" long
This one from Jim Carters,
https://oldchevytrucks.com/me437.html 43-1/4" long
'29-'54 parts manual list '32-'55 all 43-3/16" long 3/4-16 thread Left and Right
6.103 from the parts manual for steering arms,
https://chevy.oldcarmanualproject.com/1929_57chevyparts/57cmpc0524.htm6.008 from the parts manual for beam axles,
https://chevy.oldcarmanualproject.com/1929_57chevyparts/57cmpc0522.htm 6.233 from the parts manual for tie-rod fittings, ( outer housing )
https://chevy.oldcarmanualproject.com/1929_57chevyparts/57cmpc0522.htm Careful cutting the left hand threads off, a right hand thread die is much cheaper to purchase if you need to add more threads to the bar, you could probably buy a whole new bar and then some for the price of a 3/4-16 left hand thread die.
Could one of the steering arms be bent? Maybe someone with the same year of truck could measure the arms, what year is your truck?