Hello all,
I have a mistery on my hands that no one seems to be able to solve.
So, I thought I'd try here. I appreciate any info.
Thanks
The Truck: 1963 GMC C1000
Differential cover: 10 Bolt (3 inches from bottom bolt to next bolt in line)
Gear Ratio: 3.90:1
Ring gear dia: around 9" (little rough measuring with a tape measure)
