Is the splined slip joint between the front and rear section of the d/s worn out? Do you have flat washers between the three bolts heads and three nuts where they touch the flex joint? Is the exhaust/trans bracket properly installed? (is the exhaust touching something somewhere?) I know you said the U-joints are phased properly, did you keep all of the d/s pieces in exact the exact alignment to themselves as found when initially removed from the car, or are some of the pieces 180 degrees out?
84 Spider Veloce
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