vibratrions at 57-67 mph!!

HELP!!!! when i drive the car up to 57 i get a vibration and again as i get to 67-70.Its not massive and goesd away v quickly but I have just changed the front propshaft bearing on my freelander, and am worried that it is because ive not put it back together properly, even though i marked the front and back parts of the driveshaft to make sure they went back in the same position, i didnt mark the way the spline and yoke went together. I thought it only went together one way, is that right?

broken IRD bracket?

has it only happened since you put the bearing on?

I DONT KNOW DIDNT HAVE IT UP TO THOSE SPEEDS BEFORE!! it only seems to happen between 57-59, and again at about 57-60. i thought if it was prop on wrong or something it would be more throughout the range!
im hoping its just the back wheels need balancing as thats where vibration is coming from

not sure bout ird bracket as vibration seems only to be from back

sorry meant i changed rear prop shaft bearing