Mating a 58x engine to earlier 4l60e - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LeesTruk · 10-13-2018, 03:42 PM

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

LeesTruk · 10-14-2018, 06:50 AM

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

10-13-2018, 03:42 PM	#1
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 429	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

10-14-2018, 06:50 AM	#2
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 429	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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