[verdell]

Just ran across this thread and wanted to share what I have. I swapped out the 1960 HO32 for a 1965 12 bolt and always thought it may have been a tad too short. It never gave me any issues so ran it for years. I recently found out I have an unpleasant vibration just over 90 mph. Checked pinion angles, tranny mounts, axles, every thing but according to a drive train specialist in this area, my driveshaft is short. This seems to be the cause of the vibration. Just an FYI...