Is there manual hubs available for the 1994 K-1500 4×4 truck?
No, there are no manual hubs on the 94 Silerado. They have an independant front suspension that doesn’t have hubs. All the engaging is done in the front differential. If you look under the front of the truck, you will see the half shafts (or CV axles, smae thing), and where they bolt to the center chunk.