AE111 driveshaft?final drive differential?problem!

[AE!!!925]

HI to all,i recently replace both left n right drive shaft,brand new,KEBO brand(best in malaysia they said,i dont know)!Everything was ok at first till the fourth day,my car vibrate(abnormal) when i try to accelerate my car at 3rd or 4th gear at 2500-3500 RPM,over 3000rpm,the vibration is gone,i wonder anyone here have the same problem with me,could it be the drive shaft?or the differential?or engine mounting? any suggestion from all the masters,sifu out there?THANKS!!