HELP: Clunk in rear

[xupkid2]

I need help brainstorming. I am hearing a loud clunk from the rear of my 951 race car. I recently torn out the trans and motor and when I got it all back together this clunk emerged. I thought my issue was a bad half shaft but have found that is not the issue. The car has a solid trans mount and Lindsey Ultra engine mounts that do not have any issues. The sound is def from the rear of the car and only happens when I hit the gas fairly hard and put some torque on the drivetrain, kind of like making it jerk when you are going slow and hit the throttle hard for a split second. It sounds like it comes from the drivers side but that may only be because Im sitting on that side of the car. Ive checked and it is not gear dependent. Does it in 1st, 2nd and 3rd. The clunk is very loud and solid sounding. Thought it could be the torque tube moving and hitting the tabs on the torsion casing but it is no where near hitting and there are no signs of contact. Ive looked over the entire rear of the car and can not find anything loose or any apparent cause for the clunk.

Here is a link to a video I shot so you can hear when the sound happens. Its at night so you cant see much. My headlights dont work well. Go to 1:30 in the video.

http://www.youtube.com/watch?v=4rTAk...ature=youtu.be

Any ideas what it could be and things I can check. Im out of ideas and am heading to Sebring on Wed.

Thanks
Brian

[nize]

check to insure the transmission mount is securely attached to the transmission AND the bracket?

[Pete R]

Is the coupler from the torque tube to the input shaft tight? Are the solid mounts new? Maybe yours just hearing a noise that was alway there but there is not rubber to dampen it.

Say Hi to Gorillafoot for me @ sebring

[hansman]

I am sure you have checked this but could be one of the shock bolts?