There are some companies that sells the ring + pinion for the 10 bolt. On the 60-71' are all 6 lug, and 72' was the first year of 5 lug. The 60-72' has the same frame, coils + trailing arms in the rear. 1960-62 had torsion bar in the front suspension, and 63-72' had coils in front.
These are the rear end ratios for 1962:
3.90:1, 3.38:1, 3.90:1(RPO), 3.38:1(RPO), and 4.11:1(RPO)
Chevyboy62
