First of all, something must have been done wrong. I swapped out my stock TC for a 3000 stall TCI street fighter and it turned the car into a beast! I am also running the transgo kit on my AOD and I switched to 4.56's from my 3.73's.
The only thing I can think of is that your torque curve starts lower than the converter stall and that will negatively affect performance. Otherwise you should be whipped into the seats as much as before.
My transgo kit seems to favor higher gears and is less prone to downshift. This might be your problem, running in a higher gear. How are the shift points and gear selection? Maybe a tightening of the TV cable is in order to leave you in a lower gear.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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