The Shudder is a known issue. It starts from the factory EEC programming of the TC slip table. I have posted below the EEC Tuners OEM settings then the performance changes to the TC function. Other transmission changes can be made but are not listed below. Compare the TC Slip tables for 2nd and 3rd. Without tuning...Replacing the TC will resolve the shudder (for the near future).
OEM 94-95 SC (W4D2)
LOW_THROTTLE_LOCKUP 0.120117 # Converter lockup rate when not shifting, and not high TP (RPM/Sec)
HIGH_THROTTLE_LOCKUP 0.5 # Converter lockup rate when not shifting, and at high TP (RPM/Sec)
POST_SHIFT_LOCKUP_RATE 0.120117 # Converter lockup rate right after a shift(RPM/Sec)
TIME_BEFORE_CONVERTER_RELOCK 0 # Time to delay converter re-lock after tipping in from a closed throttle (Sec)
TIME_TO_KEEP_CONVERTER_LOCKED 7.99023 # Time to keep converter locked when going to closed throttle (Sec)
CONVERTER_SLIP_DURING_SHIFTS 24 # Amount of converter slip during shifts (RPM)
LOCKUP_PWM_HOLD_TIME 1 # Hold time for PWM when applying the clutch (Sec)
PRESSURE_ADDER_MANUAL_4_TO_2 20 # Pressure adder for a manual 4-2 downshift(TV)
SECOND_GEAR_UNLOCK_VS_TP # Second gear converter un-lock schedule (TP_REL-Volts, Speed-MPH)
( 4.98047, 48 ) ( 2.92969, 48 ) ( 2.92969, 100 )
( 1.34766, 100 ) ( 1.34766, 26 ) ( 0.605469, 8.5 )
( 0, 8.5 ) ( 0, 8.5 ) ( 0, 8.5 )
( 0, 8.5 )
THIRD_GEAR_UNLOCK_VS_TP # Third gear converter un-lock schedule (TP_REL-Volts, Speed-MPH)
( 4.98047, 30 ) ( 0.976562, 30 ) ( 0.488281, 16 )
( 0, 16 ) ( 0, 16 ) ( 0, 16 )
( 0, 16 ) ( 0, 16 ) ( 0, 16 )
( 0, 16 )
FOURTH_GEAR_UNLOCK_VS_TP # Fourth gear converter un-lock schedule (TP_REL-Volts, Speed-MPH)
( 4.98047, 54 ) ( 0.859375, 54 ) ( 0.273438, 40 )
( 0.273438, 34 ) ( 0, 34 ) ( 0, 34 )
( 0, 34 ) ( 0, 34 ) ( 0, 34 )
( 0, 34 )
FORWARD_TV_PRESSURE_UNDER_10_MPH # Forward TV pressure, as a function of TP, when under 10 mph (TP_REL-Volt, TV Pressure-PSI)
( 4.98047, 192 ) ( 1.46484, 192 ) ( 1.28906, 132 )
( 1.09375, 124 ) ( 0.546875, 64 ) ( 0.0976562, 40 )
( 0, 0 ) ( 0, 0 )
SECOND_GEAR_SLIP_TABLE_X_SCALING # 2nd gear slip table x Normalizer. (Vehicle Speed-MPH, Cell Number)
( 32767.5, 6 ) ( 40, 6 ) ( 26, 5 )
( 18, 1 ) ( 15, 0 ) ( 0, 0 )
THIRD_GEAR_SLIP_TABLE_X_SCALING # 3rd gear slip table x Normalizer. (Vehicle Speed-MPH, Cell Number)
( 32767.5, 6 ) ( 50, 6 ) ( 25, 1 )
( 19, 0 ) ( 0, 0 ) ( 0, 0 )
( 0, 0 )
SLIP_TABLE_Y_SCALING # Slip table Y Normalizer, all tables. (TP_REL-Volts, Cell Number)
( 1023.98, 6 ) ( 300, 6 ) ( 150, 4 )
( 50, 2 ) ( 20, 1 ) ( 10, 0 )
( 0, 0 ) ( 0, 0 )
SECOND_GEAR_CONVERTER_SLIP_TABLE # 2nd gear converter continuous slip table (RPM)
52 52 52 20 20 20 20
52 52 52 20 16 16 16
52 52 52 20 16 16 16
16 16 16 16 16 16 16
16 16 16 16 16 16 16
16 16 16 16 16 16 16
0 0 0 0 0 0 0
THIRD_GEAR_CONVERTER_SLIP_TABLE # 3rd gear converter continuous slip table (RPM)
20 20 20 20 20 20 20
32 32 32 20 20 20 20
32 32 32 20 20 20 20
20 20 20 20 16 16 16
20 20 20 20 16 16 16
12 12 16 16 16 16 16
0 0 0 0 0 0 0
SECOND_GEAR_LOCKUP_VS_TP # Second gear lockup (TP_REL-Volts, Speed-MPH)
( 4.98047, 50 ) ( 2.92969, 50 ) ( 2.92969, 105 )
( 1.34766, 105 ) ( 1.34766, 30 ) ( 0.976562, 30 )
( 0.605469, 10 ) ( 0, 10 ) ( 0, 10 )
( 0, 10 )
THIRD_GEAR_LOCKUP_VS_TP # Third gear lockup (TP_REL-Volts, Speed-MPH)
( 4.98047, 32 ) ( 0.976562, 32 ) ( 0.488281, 17.5 )
( 0, 17.5 ) ( 0, 17.5 ) ( 0, 17.5 )
( 0, 17.5 ) ( 0, 17.5 ) ( 0, 17.5 )
( 0, 17.5 )
FOURTH_GEAR_LOCKUP_VS_TP # Fourth gear lockup (TP_REL-Volts, Speed-MPH)
( 4.98047, 56 ) ( 0.898438, 56 ) ( 0.742188, 54 )
( 0.253906, 40 ) ( 0.253906, 35.5 ) ( 0, 35.5 )
( 0, 35.5 ) ( 0, 35.5 ) ( 0, 35.5 )
( 0, 35.5 )
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Performance Transmission changes (W4D2)
LOW_THROTTLE_LOCKUP 0.25 # Converter lockup rate when not shifting, and not high TP (RPM/Sec)
HIGH_THROTTLE_LOCKUP 1 # Converter lockup rate when not shifting, and at high TP (RPM/Sec)
POST_SHIFT_LOCKUP_RATE 0.25 # Converter lockup rate right after a shift(RPM/Sec)
TIME_BEFORE_CONVERTER_RELOCK 0 # Time to delay converter re-lock after tipping in from a closed throttle (Sec)
TIME_TO_KEEP_CONVERTER_LOCKED 7.99023 # Time to keep converter locked when going to closed throttle (Sec)
CONVERTER_SLIP_DURING_SHIFTS 24 # Amount of converter slip during shifts (RPM)
LOCKUP_PWM_HOLD_TIME 0.5 # Hold time for PWM when applying the clutch (Sec)
PRESSURE_ADDER_MANUAL_4_TO_2 20 # Pressure adder for a manual 4-2 downshift(TV)
SECOND_GEAR_SLIP_TABLE_X_SCALING # 2nd gear slip table x Normalizer. (Vehicle Speed-MPH, Cell Number)
( 32767.5, 6 ) ( 40, 6 ) ( 26, 5 )
( 18, 1 ) ( 15, 0 ) ( 0, 0 )
THIRD_GEAR_SLIP_TABLE_X_SCALING # 3rd gear slip table x Normalizer. (Vehicle Speed-MPH, Cell Number)
( 32767.5, 6 ) ( 50, 6 ) ( 25, 1 )
( 19, 0 ) ( 0, 0 ) ( 0, 0 )
( 0, 0 )
SLIP_TABLE_Y_SCALING # Slip table Y Normalizer, all tables. (TP_REL-Volts, Cell Number)
( 1023.98, 6 ) ( 300, 6 ) ( 150, 4 )
( 50, 2 ) ( 20, 1 ) ( 10, 0 )
( 0, 0 ) ( 0, 0 )
SECOND_GEAR_CONVERTER_SLIP_TABLE # 2nd gear converter continuous slip table (RPM)
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
THIRD_GEAR_CONVERTER_SLIP_TABLE # 3rd gear converter continuous slip table (RPM)
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
MAX_TORQUE_IN_GEAR # Maximum allowed input torque in each gear. (ft-lbs)
1020 1020 1020 1020 1020
SECOND_GEAR_LOCKUP_VS_TP # Second gear lockup (TP_REL-Volts, Speed-MPH)
( 4.98047, 50 ) ( 2.92969, 50 ) ( 2.92969, 105 )
( 1.34766, 105 ) ( 1.34766, 30 ) ( 0.976562, 30 )
( 0.605469, 10 ) ( 0, 10 ) ( 0, 10 )
( 0, 10 )
THIRD_GEAR_LOCKUP_VS_TP # Third gear lockup (TP_REL-Volts, Speed-MPH)
( 4.98047, 32 ) ( 0.976562, 32 ) ( 0.488281, 17.5 )
( 0, 17.5 ) ( 0, 17.5 ) ( 0, 17.5 )
( 0, 17.5 ) ( 0, 17.5 ) ( 0, 17.5 )
( 0, 17.5 )
FOURTH_GEAR_LOCKUP_VS_TP # Fourth gear lockup (TP_REL-Volts, Speed-MPH)
( 4.98047, 56 ) ( 0.898438, 56 ) ( 0.742188, 54 )
( 0.253906, 40 ) ( 0.253906, 35.5 ) ( 0, 35.5 )
( 0, 35.5 ) ( 0, 35.5 ) ( 0, 35.5 )
( 0, 35.5 )
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