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Old 10-13-2018, 03:42 PM   #1
LeesTruk
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Join Date: Mar 2015
Location: Manchester, CT
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Mating a 58x engine to earlier 4l60e

Thinking ahead to a possible "next project". When mating a LY5 5.3L to a pre-'07 4L60E trans., what is needed for electronics? It's to my prehistoric understanding (71 yrs.) that 58x engines use an ECM that does not control trans. function, so I'm guessing a TCM must be used for the trans., correct? How do the two controllers "talk" to one another? Is a special harness required, or can a vendor incorporate what's needed to make the engine/trans. compatible? Thanks
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Old 10-14-2018, 06:50 AM   #2
LeesTruk
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Re: Mating a 58x engine to earlier 4l60e

I think I've found my own answers. When using an e38 ecm, a TCM must be incorporated, and is provided for by the harness vendor, doesn't matter the year of the trans. Just a few more details to attend to, than a Gen III swap
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