Furthermore, the differential area between the band apply area and the release side of the servo piston alters the 3-4 clutch accumulation rate making the 2-3 shift firmer. Consequently, this servo provides a shorter, firmer 1-2 shift and with an increased apply area, provides the 2-4 band greater torque capacity in second gear only. The TransGo 7-2P servo has the largest 2 nd apply surface area of all the original equipment servos. The Corvette-type piston was primarily found in the tuned, port-injected Corvette as well as the high performance Camaro and Firebird. From the factory, the 700R4 and 4L60E transmissions were equipped with 4 different servo sizes based on application. I'll be interested in Frank Performabuilts insight on this as well.The TransGo 7-2P Corvette servo piston assembly fits 1982 to 2015 General Motors vehicles equipped with 700R4, 4L60/E, 4L65E and 4L70E automatic transmissions. I know this is kinda off topic but I figured I would throw it out there.

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.

Corvette servo 4l60e