thinking 5.3 swap....need advice

[SBTork]

Ok, so I just put a new 700R4 transmission into my '85 Suburban recently and it's doing great. It's a level 2 unit from bowtieoverdrives. I am thinking of getting a 5.3 out of lets say an '04 Suburban, but I want to know how and what's involved in getting that to work with my old TV cable operated 700R4. I am sure people have done this but when I try to find info now, I cannot. Any help is appricated.