Looks like the torque rod that limits transmission movement by securing it to the cars frame. You should tighten that bolt. Actually, you should replace the bushings on it, then bolt it back up. Which reminds me, I should check on mine lol.
Front Torque Bar:
- Engine does not need to be supported from below for this part of job
- Remove bolt securing bar to front cross-frame (long profile wrenches needed)
- Remove bolt securing bar to transmisison bracket
- Remove bar and install new
- Torque for bolt at transmisison end is 35 ft-lbs
- Torque for bolt at front cross-frame end is 90 ft-lbs (why long wrenches are needed!)