well looked at the number on the back of the diff and its a 3.07, turned the drive shaft and watched the tires to make sure some one hadnt changed out the gears and its for sure a 3.07 so Im back to stage 1 what in the world could be making it that far off ? the tires might do a couple mph at the most so im kinda at a loss

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82 240D (82 300D drive train)