Also just to let you know that servo is very tough to put in and place the retainer ring at the same time so make sure you can use 4 hands, two to push the servo in while the other two puts the o-ring in and the retainer in. I had to put both on mine e when I did the change, but try the above mentioned, before installing.
It has to have a 1/16 of an inch play, or so, not too loose or you'll end up burning that band. that way you wont put too much pressure in your tranny band. That servo is tough, but before you place the seal on the cover, make sure you can turn your drive line ok, if it is too hard, use one washer, but if it feels loose use them both. I'll be interested in Frank Performabuilts insight on this as well.I have one in my 2004 chevy avalanche. 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.
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