I could be the rear trans mount or drive shafts too. Is that a continuous clicking sound or just intermittent knock sound? Before you buy anything its a good idea to find out the actual problem. Try driving in circles with steering full lock and see if the sound gets worse. Try both left and right. It should make more noise when you turn becoz thats when CV joints do their job. This way you will also know which one is gone. You can replace them individually means left inner, left outer, right inner, right outer and center shaft. If it is outer ones then you can get away cheaply. If it does the sound only in straight line it could be bearings or mounts.
__________________
Ex Cougar - 00' MTX 2.5L (Limited edition Eibach Cougar); Dark Green Tourmaline; Lowered with Eibach tuned suspension from factory; SVT UIM, LIM & Throttle body; Supercat 2.5" dual exhaust with twin pipe quad outlets; Custom headers; Custom coloured instrument cluster; K&N Apollo CAI kit; Calibre oil catch can.
Now driving a Lexus RX 450h. Your guess is correct that I am a family man now. 
|