If the fluid is not burnt, you can fix or reduce by increasing pressure by either of these two ways:
1. With a programmer, set the 1-2 shift pressures to ~12 PSI above stock.
2. Without a programmer, drop the trans pan, adjust the electric pressure control solenoid screw about 1/8-1/4 turn in. It's on the solenoid itself and you use an allen wrench. You will have to remove one of the accumulators to access the screw, that's easy, just a few bolts.
Of course you should realize if the fluid is burnt then increasing pressure will only, mask the symptom.
1. With a programmer, set the 1-2 shift pressures to ~12 PSI above stock.
2. Without a programmer, drop the trans pan, adjust the electric pressure control solenoid screw about 1/8-1/4 turn in. It's on the solenoid itself and you use an allen wrench. You will have to remove one of the accumulators to access the screw, that's easy, just a few bolts.
Of course you should realize if the fluid is burnt then increasing pressure will only, mask the symptom.