A Gearvendors on the back of the 727 would give you a 6 speed with an OD that would be a good fit with a 3.55 or 3.73 gear.
Final drive in OD would be 2.76 and 2.90 respectively.
The gear splitting that GV touts always came across as a gimmick to me. Not enough spread in the ratios to make that really worth anything.
8HP70: 4.7143 3.1429 2.1064 1.6667 1.2847 1.0000 0.8392 0.6667
727: 2.54 1.45 1.0
GV can only split between those ratios on the 727. I haven't read of any way to control an 8HP70 through aftermarket though.
