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Sounds like the seller is claiming the 3.55 gears to be original.....first time I've heard of that
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Although not as common as 373 or 410, 355's are not that rare. I am not sure if is documented but i have heard of a car z with 331's. Those higher gear ratio require a wide ratio trans or they are a real dog to get going. 373 was the standard ratio for a 69 z, the others were optional.