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I can't seem to identify any 3:90's at the yards. Popular website states ALL 81 thru 83 non turbo's have it, they're also supposed to have the white 19 tooth speedo cog. Every 81-83 ZX I tried had the black cog indicating 3:54 gears. What part of my info is wrong, the cog color, the non turbo part, or the years of the cars. Pulling the diff cover is really not an option at the yards. thanks for any help