First, I have a 2002 Camaro Z28 with the 4L60e trans, anybody installed
the Energy Suspension Trans mount or Torque Arm mount with any
obstructions, as far as bolt diameter through the crossmember! I heard
some machine work would be necessary to allow access of the
"energy suspension trans mount", in regards that the mounting bolt is
a larger diameter than the original? Just rumor?? Thanks.

 

There are multiple threads here from people complaining about vibrations which turn out to be caused by Poly trans mounts. The vibrations/noises/clunks go away when they install a stock trans mount.
Disclaimer - I don't have personal experience with them on a Gen-4, but perhaps others can give you personal feedback.

 

Just found a new post about poly mounts causing vibration.
See #53 in this thread:

https://ls1tech.com/forums/automatic...ckwards-3.html

 

No need for poly, no need to deal with Hawks either. Lose/lose.

 

Thanks guys for the input! Word of advice, they don't line up with stock crossmembers, I ******* returned it. Garbage. Thanks again guys.