You're killing me, it's "what!"
If you're saying all you installed into the transmission is the transgo kit. Then you're on borrowed time as is (at a true 500hp); in no-way shape or fashion is that kit capable of holding 600hp{Let alone 500hp(it truly holds 400-425hp on a healthy transmission with good tuning)}, regardless of what the literature says.
You're going to need a full on build: clutches, converter, etc.
Now, if you have a full on build, ignore what I said. However, you're not leading us to believed that; as a transgo alone, doesn't qualify as a build.