4L60-E Build Up
The 3-4 clutches do need to be improved, and the best material is the "Hi-Energy", used in OE setups, but you need more than 6. I currently use 8 and has worked well.
As far as 8 frictions, I'm using stock apply plate and stock snap-ring. I use a combination of thick and thin steels and clutches with the thinnest backing plate GM offers.
As far as 8 frictions, I'm using stock apply plate and stock snap-ring. I use a combination of thick and thin steels and clutches with the thinnest backing plate GM offers.

