Has anyone replaced the lower, rear mount by the rack? I believe it is called a "trans mount"? Any good write ups?

 

I have been using the poly mounts for a while and they are great so far. They are stiff though. You can use your stock mounts and pry out the OEM insterts. Gotta warn ya they will send a few vibrations through the car when taking off. Not very noticeable at cruising though.

https://www.chevyhhr.net/forums/drivetrain-excluding-engine-57/polyurethane-transmission-mounts-36963/

These are the ones I am using:

http://www.turbotechracing.com/produ...dcategory=5615