We have a roster done by unit company clerks in 1945 of the members of the 36th Infantry Division. It lists ranks as :
T/4 and Tec 4 both used
T/5 and Tec 5 both used
Officers are pretty much as today.
Texas Military Forces Museum
Thank you! That's very helpful and puts things into perspective.
After looking through many original wartime documents, it does seem that different abbreviations were used, so perhaps there was no singular "official" listing. The list I have on hand which was created internally at some point also uses Pfc and Cpl rather than PFC and CPL (in addition to Tec 4 rather than T/4), but it may be that all of these were acceptable.