My copy of the "Chevrolet Pickup Red Book" (Motorbooks International, 1946-1972) says for 1949:
Total = 383,543
1/2T = 201,537
3/4T = 97,668
1949 is the only AD year that has that breakdown. This out-of-print book is really hit or miss.
Hit or miss for sure.
That 1/2 ton figure also covers the sedan delivery, suburbans, panel vans , canopy express & all of the other configurations
{such as flat face cowl 3102 ,cab chassis 3103 bodies & chassis/cowl w/ windshield 3112 models }.
There is no way of telling how many 1/2 ton stepside trucks were actually produced. Same thing for the 3/4 ton figure.