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Although the two transmission mounts look fairly similar, they differ greatly. The Energy Suspension mount (right) is made of polyurethane and has a safety locking design to prevent mishaps during extreme driving conditions. Plus, the mount can be used on GM automatic (including TH400) and manual (including three-, four- and five-speed) transmissions. Our stock tranny mount was bent and covered in grime, and the rubber was severely cracked and starting to crumble.