The other day I replaced my transmission mount and torque arm. The transmission mount I used was the Energy Suspension model (PN 3.1108G) used in some GM cars & trucks. I got the idea from Mean Max in his replacement thread. This is how I did the installation and things may not work out the same for you!
This was my original mount, probably at least 15 years old. It may or may not have needed to be replaced, but replacing it certainly won't hurt.
First, support your transmission. Then, remove the two nuts (5/8") that hold the transmission mount to the skid plate and the torque arm stud nut (9/16") (mine was broken from when I installed my transfer case drop and didn't really know I should have removed that nut
Next remove the six bolts (3/4") holding the transfer case skid plate to the frame. My transfer case and driveshafts are missing from this picture, but yours should still be there (if they're not, your Jeep is not drivable and you should go find one!
The transmission mount is held to the mounting bracket by two bolts (5/8"). Mine were stripped pretty badly, but I was able to get them off. I promptly replaced them, though, so that I would not have any trouble with them in the future. You may also have some sort of exhaust hanger on your mount, but mine was broken and I was not replacing it so I did not have to worry about this.
I cleaned up my mounting bracket a bit and removed the other nut on the torque arm stud. It should be the same size as the first. Since my torque arm was broken, I replaced the arm (4wd.com PN OAI18608.05
- $4) and the bushings (Energy Suspension PN 2.1101G
- $5). I also needed some hardware (washers, nuts, etc.) so I picked it up at the local hardware store while I was replacing the bolts that hold the mounting bracket to the transmission. That all ran me about $2.
Insert into the longer part of the torque arm the a washer and a bushing. Place the torque arm in the appropriate location in the mounting bracket. Place the other bushing, washer, and nut on the top and tighten the nut up to 20-35 ft-lbs.
Place the new transmission mount below the mounting bracket but don't forget the preload plate (I did this and then had to unbolt the mount and put in there. Bolt the mount back up to the mounting bracket.
Bolt the skid plate back up with the six 3/4" bolts and install the bolts and washers up to the transmission mount using the included hardware from your mount. For the torque arm, use two washers and place tighten the nut to 20-35 ft-lbs.
The new mount has flat bolts instead of studs sticking through the plate, so that is two less things for your skid to get stuck on.
Here is a diagram of everything for reference.