[coldkilla]

my 1-2 shifts are quite firm and this morning when i was driving to work a heard a LOUD BOOM underneath the car! something is loose or broken and i believe whatever it is, is smacking the underside of the vehicle cuz it really doesnt sound like one part hitting another. every time i make a 1-2 shift there it is again and it did it when the tranny downshifted to 2nd when i floored it on the highway too. what the **** could this be? im 99 percent sure its coming from the p/s rear so i dont think its a tranny mount cuz that would come from right about next to my seat right? there are absolutely no drivability issues, the rear doesnt feel loose and i dont hear the tire rub the fender at all. i dont have time to jack it up today so im doing it tomorrow morning, i did take a quick look underneath and everything i could see, sway bar, shocks lca's lower phb mount, lower torque arm mount etc. all seem to be fine and i dont see any damage. what could be doing this that wouldnt cause any problems driving? maybe my upper torque arm mount snapped and its hitting the car when the rear end bucks under the hard shifts? my buttmeter feels like the p/s rear tire is running over something everytime the sound occurs also. anyways im gonna check tomorrow so ill post what i find but any ideas or suggestions are appreciated, thanks!