shuttering noise?Ujoints?transmount?torquearm?

[BlackZ28629]

Ok..I have a shuttering noise coming from what sounds like the rear of the car, but I cant be certain. I know the tranny has gotten a little sloppy in performance as far as vibration and clunking goes. When Im driving down the street, under acceleration its not evident, but if I take my foot completely off the pedal and someitmes manipulate the steering wheel turning left a little, its makes a horrible shuttering noise like something is loose or broken. Sometimes it makes the noise going straight. i have heard the noise for a few months now, but ever since I put my Eibachs, shocks/struts, LCAs w/ relo brackets, and PHR on, the noise has become more evident and more consistent. Any ideas? I think its either the trans mount, or something to do with the U joints or torque arm. How can I check these besides visual inspection, of course?

[Redphoenix1998]

check the mount at the transmission for the torque arm. The bushing is either worn or the bolt is loose.

[CDS98Z28]

i have the same problem and i found so far that the torque arm bushing is ripped so i ordered a edelbrock torque arm and new bushing. i also need a rack and pinion