Torque arm stud lives right next to the transmission mount, driver's side and bolts through the skid plate. You should see the bottom nut under the skid next to the 2 tranny mount nuts. Stabilizes the drivetrain when it tries to twist (torque) under acceleration. Drivetrain won't twist as much if you're already up to speed....
Seen here at the top center of the display picture. The 2 rubber bushings and nuts go with it.
You may be able to find just the stud itself.
Oh, and try to fill out your profile as much as you can...we're flying blind here. You do have a Wrangler, right?