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Can I convert ls1 Engine auto trans to t56


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Can I convert ls1 Engine with auto trans to t56? Will there be any problems with the ecu and harness after the change. Will the car run with that setup? Thanks

 

 

The LS1 I bought came with a 4L60E auto trans. I bought a T-56 and installed it in place of the auto. The car ran fine with the computer as-is from the auto. I drove it that way for several months before I finally had it reprogrammed for the 6 speed. It did throw a few codes and the signal for the speedo was wrong but other then that, it still worked fine.

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like qwik240z said, you can prolly convert easily from auto to manual because with MT the driver controls all the shifting. Converting MT to auto might pose a problem as the software and sensor that control automatic shifting might not exist in the MT car. I know converting from M6 to A4 is not what you want, but I am just saying.

 

I am still torn between A4 and M6...qwik240z, do you still have the auto trans?

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  • 5 months later...

You don't need to rewire the harness. The PCM connectors should have all the wires to support auto trans or the T56. For the auto trans the PCM controls the TCC (Torque converter clutch) and it needs the input signal from the brake. For the T56 I forgot what the PCM controls but it needs the input signal from the clutch. If you need wiring info let me know. I will have to go back to do some more reading on the T56. GL

Vinh

PS. I can rewire the harness also.

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You don't need to rewire the harness. The PCM connectors should have all the wires to support auto trans or the T56. For the auto trans the PCM controls the TCC (Torque converter clutch) and it needs the input signal from the brake. For the T56 I forgot what the PCM controls but it needs the input signal from the clutch. If you need wiring info let me know. I will have to go back to do some more reading on the T56. GL

Vinh

PS. I can rewire the harness also.

 

That's the kind of post I love to see in that you get an answer and an offer to help all at the same time.... Only on HybridZ:smile::-):smile:.

 

 

LARRY

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Larry,

lol..

 

Here is the PCM wiring pinouts that I save only the wires that have something to do with both transmissions. Most of these are for the auto trans. I remember there are 3 connectors on the T56 and they are for: Reverse lock out selenoid, Skip shift selenoid and the last one is the reverse light switch. The reverse light switch wires do not go to the PCM. So you just need to remove all the wires for the auto trans and hook up 4 wires from the T56 to the PCM for the reverse lock out selenoid and the skip shift selenoid. Important: Make sure you get the connectors to all the sensors/switches on the T56. GL

Vinh

 

 

 

 

Document ID# 1021267

2004 Pontiac GTO

 

 

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Powertrain Control Module (PCM) Connector End Views

Table 1: PCM Connector C1

Table 2: PCM Connector C2

PCM Connector C1

 

 

 

Connector Part Information

PCM Connector C1 92231110

80-Way Micro-Pack 100W Series Sealed (BU)

 

Pin

Wire Color

Circuit No.

Function

 

 

17

YE

1225

Transmission Fluid Pressure Switch Signal B

 

18

GY

1226

Transmission Fluid Pressure Switch Signal C

 

32

BU/WH

771

Transmission Range Switch Signal A

 

33

BN

86

Cruise Control Release Signal

 

34

WH

776

Transmission Range Switch Signal P

 

53

BK/WH

2762

Low Reference - TFT Sensor

 

 

72

YE/RD

772

Transmission Range Switch Signal B

 

 

79

GN/WH or GY

898 or 587

Shift Solenoid Valve 3 High Control - Skip/Shift Solenoid Control

 

 

PCM Connector C2

 

Connector Part Information

PCM Connector C2 92231110

80-Way Micro-Pack 100W Series Sealed (GN)

 

Pin

Wire Color

Circuit No.

Function

 

2

BN

418

TCC PWM Solenoid Valve Control

 

6

RD

1228

PC Solenoid Valve High Control Sol.A

 

8

GY/BU

1229

PC Solenoid Valve Low Control Sol.A

 

20

TN

1231

AT ISS Low Signal

 

21

BU/WH

1230

AT ISS High Signal

 

42

GY/RD

422

TCC Solenoid Valve Control

 

44

YE

1652

Reverse Lock Out Solenoid Control

 

47

YE/BK

1223

2-3 Shift Solenoid Valve Control

 

48

L-GN

1222

1-2 Shift Solenoid Valve Control

 

51

YE/BK

1227

TFT Sensor Signal

 

62

GY

773

Transmission Range Switch Signal C

 

63

BN/YE

1224

Transmission Fluid Pressure Switch Signal A

 

 

--------------------------------------------------------------------------------

Document ID# 1021267

2004 Pontiac GTO

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