Madmike's source says its a 3.36 non-locking. The best guesstimate way to check is to jack up your rear and rotate your rear tires. Count how many times the input shaft rotates for 1 turn of the tire.
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1970 Camaro Z28
blue w/ white stripes
396/auto/posi My 70 Z28
[This message has been edited by JG_80Z (edited 08-26-2000).]