Hey guys... I have a 1939 Ford sedan with a 1952 Merc. Flathead in it. It "was" running and driving pretty good until it warmed up good and then it had transmission chatter which sounded and felt like input shaft bearings. I had the transmission rebuilt and when reassemble - now it has an severe vibration which it did not have prior to the rebuild. The u-joint has been replaced but it did not help. Any advice at all would be very very appreciated. Thanks in advance.. The guys at the transmission shop have no clue.... If someone can help -I can be reached at 512-four22-eight 206.