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SBC vs LSX 4l60E Questions

This is a discussion on SBC vs LSX 4l60E Questions within the Automatic Transmission forums, part of the Drivetrain category; I'm in the process of gathering parts/info to put a 2003 LQ4 6.0 in a 1972 Cutlass. I have a ...

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    SBC vs LSX 4l60E Questions

    I'm in the process of gathering parts/info to put a 2003 LQ4 6.0 in a 1972 Cutlass.
    I have a 4L60E (618MSDR20306505) it has a SBC/LT1 removable bellhousing.
    If I get an LSX style Bellhousing will the transmission electronics work with the 2003 PCM?

    Thanks in advance for your help.

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    Senior Member JaycenK's Avatar
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    What is the 2003 pcm from? As far as I know the electronics are the same in the 4l60E's I think as long as you have a pcm that was playing with a 4l60E from the factory it should work but I would verify pin conections from the 03 harness and pcm to make sure the go to the right pin conections on the trans if no one else knows.

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    Member performabuilt's Avatar
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    The electronics will be no issue , However swapping the bell will not work the input shaft and pump stator are different and longer for the LSX so the bell is deeper. You can however use the LT1 version and use a sleeve you can get from TCI to accomodate the converter pilot size difference.
    But you would us all the LT1 stuff converter bell and trans. Try using the LSX bell and at best it wont enage the pump and wont move and at worse its will destroy the pump and converter .

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    Thanks for the replies. The PCM harness and motor are from a truck with a 4l60E. So we can use an LSX style bellhousing, front pump and input shaft correct?

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    Senior Member JaycenK's Avatar
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    so your using an LSx motor with an lt1 trans at this point corect?
    You want to change the input shaft and pump on the lt1 trans and put in and LSx pump and input shaft and use an LSx bell to bolt up to the LSx motor correct?

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    That was the plan but GM makes a spacer for putting a 4L80E behind a 6.0 that also will alow me to use the LT1 style trans behind an LSX motor

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    Senior Member JaycenK's Avatar
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    lol, so new plan?
    4l80e is a lot tuffer than the 60E.

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    yea but the 4L80E weighs 235 lbs and I'll have to modify the floorboard/ trans tunnel. The 4L60E weighs 155 lbs, fits the floorpan without modifications and will handle the 425 horse power I plan on putting to it.

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