I'll be interested in Frank Performabuilts insight on this as well. Find many great new & used options and get the best deals for 4l60e complete corvette servo assembly easy to install heavy duty shift kit at the best online. I know this is kinda off topic but I figured I would throw it out there. Total charge for the servo and install was 75 cash.
I was going to take it to a tuning shop, but then thought maybe I would do it myself, I am putting together a list of pros and cons regarding getting. Both run pretty well but are in need of a tune. 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. In the last year I have completed an LS3/TR6060 swap from a 2013 SS Camaro into a '73 Corvette, and a LS6/4L60E from a 2002 Z28 into a '75 Corvette. 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.
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