Stop in for a cup of coffee

Question for the crew.....If running a front engine plate, is it recommended to solid mount the transmission too? I have rubber mount on trans now. I am hearing something at idle in gear. I know the sketchy guy who built this trans so it could be his fault (me). It seems to work well, shifts well, although doesn't shift as violent as a reverse pattern valve body has for me in the past. Thoughts?
Never use a solid transmission mount with solid engine mounts unless it is a full cage race car. The transmission mount needs to have some flex or you risk breaking the bellhousing when the body flexes under load.

A rubber mount is ok, but generally too flexible for solid engine mounts and they can tear as a result. Best to use a polyurethane trans mount.