Sprayed on track - somethign broke in the rear suspension... cannot figure out what
Greetings all. So yesterday I took my stock 5.0 with gears, exhaust, and Kenny Brown weld in subframes to the track. Tried launching on a about an 80 shot and something broke on the 1-2 shift. Felt like the whole car was like twisting or something. Caused me steering problems going down the track. Back end felt like it was swinging all over. I put my car on a lift and inspected the links for the lower control arms(MM weight jackers, just installed last week) and everything looked good. Uppers are still stockers with high millage but the fasteners on everything looked like they were all in the right place. Torque boxes seem OK. A small gap/seam on the bottom edge both of them in the same place but I think it might be factory. Car has a tko500 with poly mount. Motor mounts were bad as well, went to install poly's but I was sent to passenger side mounts. Installed that one and put the torn up stocker back in place on the drivers side, car did not have this issue prior to yesterday though and have had smoked motor mounts all year. Installing the one good motor mount did not seem to affect the situation at all though.
Anyone have any ideas wtf I did to my car? Whenever I get into torque the whole back end of the car likes swings sideways as it loads up. I'm at a total loss on this.
Any input appreciated, thanks Corral!