Purely fyi: a corvette second gear servo by itself isnt going to spin the tires or generate a super firm 1-2 shift. It can potentially generate such shifts in combo with mods done to the separator plate, valve body's 1-2 acc valve and 1-2 accumulator housing. Would be curious to see what was done with those other three things...if its too firm at light / part throttle the 1-2 feed orifice is likely drilled too big and accumulator housing shimmed too much for the TC's stall speed."Did they install the Corvette Servo? I have the same behavior in my LS swapped truck. The WOT 1-2 shift will spin the tires like crazy. Even at light throttle it's a very firm shift."
Yes, I'm pretty sure he installed the Corvette servo.
For street driven vehicles set up for performance, part throttle shifts shouldnt feel too different than stock while WOT shifts should be crisp/quick with no lag.