That be right Jerry, the ring gear stamps mean p.n. 3682104 7-32 (4.57 ratio), 7-54 (Jul, 1954).
And Jerry's also correct as fur as finding a 4.10, that would be the only option. Find a 1968-72 V8 auto C20-30 and it may have one.
Denny Graham
Sandwich, IL
