I swapped the running gear of a 76 Chev Blazer into my 55 1/2 ton. I am using the 203 transfer case with a part
time conversion kit. That gives me 12 bolt differentials and 3.73:1 gearing.
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