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PCM TCM 4l80e idiot question

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Old Jan 6, 2010 | 01:57 PM
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Default PCM TCM 4l80e idiot question
Does the PCM control the 4l80e? I keep hearing how I'll need a TCM to control it, but I was under the thought process that the TCM was only necessary if I was using a carb setup.

Is the TCM an external or internal device if it is needed?

My mustang has the painless 4l60e harness but has always had either a t56 or th350 in it, but all the plugs are there. I just wanna put this thing in as cleanly as possible
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Old Jan 6, 2010 | 03:39 PM
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Originally Posted by cjmatt
Does the PCM control the 4l80e? I keep hearing how I'll need a TCM to control it, but I was under the thought process that the TCM was only necessary if I was using a carb setup.

Is the TCM an external or internal device if it is needed?

My mustang has the painless 4l60e harness but has always had either a t56 or th350 in it, but all the plugs are there. I just wanna put this thing in as cleanly as possible
Depends on the year of the PCM. Newer PCMs don't control the transmission, and it has a seperate TCM.
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Old Jan 6, 2010 | 05:02 PM
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Originally Posted by slow67
Depends on the year of the PCM. Newer PCMs don't control the transmission, and it has a seperate TCM.
its a 99 ls1 pcm
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Old Jan 6, 2010 | 06:12 PM
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Originally Posted by cjmatt
its a 99 ls1 pcm
Then your PCM controls the trans.
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Old Jan 6, 2010 | 07:28 PM
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ok whew, i know i gotta repin it and all, i was just hoping i didnt have to buy another module
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Old Jan 7, 2010 | 12:34 PM
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you'll have to get a segment swap
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