Getting closer to buying my truck. Still trying to decide whether I want to go with a G56 or 68RFE.

I tried to do a bit of research on here before I asked about this, but didn't come across anything, but if there's a thread about it, maybe someone can direct me to it.

What I want to know is, if I put Ray's deleted tunes on a 68RFE, what trans upgrades would be recommended so that I could run the truck on the higher HP tunes?