The 16197427 will operate a 4L80E using either $OE or $31, see links below.

http://www.gearhead-efi.com/Fuel-Inj...Information-OE

http://www.gearhead-efi.com/Fuel-Inj...Information-31

The additional link below is STRICTLY for a 1227747 with TH400 to 16197427 conversion. Converting a 1227747 to 16197427 using a 4L80E requires adding wiring for a VSSB / DRAC and wiring for the 4L80E transmission.

http://www.gearhead-efi.com/Fuel-Inj...out-Directions!

dave w