Thread: Allison 6sp: Lbz 2wd to 4wd questions!
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Old 09-10-2019, 06:46 AM
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PureHybrid PureHybrid is offline
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Join Date: Feb 2012
Location: Central OH
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Not sure if 06+ is different, but when I 4wd swapped mine, I just hooked up the harness. Didn't have to reflash anything, just had to source the TCCM and hook it up. From what I remember, Ben said the calibrations are the same, you just have to run a signal wire for 4LO so the ECM / TCM knows
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04 GMC ECSB LLY - Mix breed trans/SC1056 - Kennedy twin pumps/pickup - 531/944
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