2007 ly6 and 2000 4l80e
easiest way is to buy a newer trans 07' or newer trans,,than u can keep vvt.. cost might be the same as to convert it to genIII ecm..
or put manuel valve body.. or seperate 4l80e controller on it.. this is just based on my knowledge,,so maybe someone else can chrime in..
im just going to run a manuel valve body.. 3200 stall and 10 psi boost,,same motor..08'


