I'll be interested in Frank Performabuilts insight on this as well. This cable is often mistaken for a 'kick down' cable as used in the TH350. I know this is kinda off topic but I figured I would throw it out there. 4l60e corvette servo install in 4x4 without removing trans tv The TV cable in the 700 plays a much more important role than simply commanding forced down shift.

Basically Im saying to 'properly' do it requires the mechanical parts and upgrades to make firm shifts rather than relying on tuning to solve it for you with forced pressures. 90psi is the stock pressure for 05/06 GTOs and I still use that setting with my built trans with shifts recorded. IMO, a proper shift kit should be utilized to deal with shift upgrades rather than taking shift pressures above 90psi with tuning alone. There is a decent trans guy on the HPT forum that always says dont bump line pressure without it. The Corvette servo can help in firming up the 1-2 shift and I've also read that it is more apt to dealing with shift pressure increases. There is also aftermarket servos that are just as good or better made by companies such as Sonnax, TransGo.etc.

The 4L60/65E series 'Corvette servo' will work in non-equipped models.

Install corvette servo 4l60e