66 American with vibration at low speed

["Jay" <jciampi@xxxxxxxx>]

OK guys, I took my driveshaft loose and rotated it 180 degrees and that 
seemed to help a bit but didn't eliminate it altogether. I have a new oil 
seal in the tailshaft (A/T) but there is a bit of sideplay between the 
tailshaft housing and the splined shaft on the end of the u-joint. I was 
told there shouldn't be ANY sideplay. Yes/no?  I haven't looked yet at my 
IPC, but is there a bearing in the end of the tailshaft that needs 
replacement?
This is related ot the vibration I get at about 35 mph.

Jay in FL.