my 04 Honda CRV shaking in speed 50 to 60 MPH, happened after changing transmission fluid, differential fluid, tire changed also 2 times. pepboys told me i need to change both front axle, a family michanic told me the drive shaft is the one need to be changed. which one i have to believe?

 

It sounds like front CV axles to me, but you can easily check if it's the drive shaft by removing it and seeing if the shake is gone. Probably worth checking the motor mounts as well.

 

CV joints/axles or maybe the tire balancing?