I am not absolutely positive, but If I remember correctly, the 1/2 ton parts are smaller. The 3/4 and the one ton may be the same.
Bob


55 Cameo 396 TH 400 with overdrive
65 Caliente conv
67 BB Caliente conv
67 Mercury 1 Ton
76 GMC 3/4 ton 454ci
84 Buick Turbo Regal