I belive most newer transmissions are electronically controlled which means the shift kit can't effect when it shifts just how hard it shifts. The computer tells the transmission when to shift.
but I don't know when they started going to electronic shifting on the aod's.
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'89 GT
K&N, Twisted Wedge heads, TFS intake,FMS 1.7 rockers, Trick Flow stage 1 cam(221*/225* .530in\.542in) , 3.73's, headers, off road H-pipe, Flowmasters, FMS Clutch, Tremec, PRO-5.0, FMS driveshaft, fluidyne alum. radiator, and more to come.
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