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Google "Torque for rear axle nut on C6 Corvette".....I found it on another Corvette forum, I think it may have been "Vette" forum.
It sounds to me as if you have an early C6 with the flat face flagged nuts? Both my cars have just over 40K miles; the C5 with the flat nuts were loose but the '12 with the newer style nuts and hub were still torqued at approximately 140. It appears to me that the boys and girls back in Milford did their homework.
My car is a '09. I have heard there was a change concerning axle nuts in the later models. Haven't had a chance to check but a change was needed. The '02 we had (now sold) had loose axle nuts at one time as well. Torqued them to 160, marked them and had no further issues.