Welcome.

The main problem with the LS4 motor and the trans is heat, heat will kill it fast and often does. I tell just about everyone that owns a GXP to run a trans cooler.

The search feature is on the top of the sceen hidden in the black, you can search for various threads on here and I would recommend jumping over to LS1tech.com and trolling through the LS4 section and reading up on common issues aswell as what they are running for a cooler.