Weird vibration

[caveman85]

Hey all....im getting some weird vibrations above 20 mph when i let off the gas....when im on the gas(enough to keep me at speed) there is no vibration, it feels like its from the middle of the car goin back.....I checked my guibo, looks brand spankin new, and my csb, no play in it what so ever, is it possible for the u joints on the drive shaft to act like this if theyre binding up cause I thought youd only get vibrations if it was under hard acceleration.

as always thanks for the help in advance

[caveman85]

never mind....turns out some how my right rear wheel had come loose and was causing the vibrations