’90 R20 Suburban 4L80e swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

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’90 R20 Suburban 4L80e swap

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08-15-2012, 12:37 PM	#1
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	’90 R20 Suburban 4L80e swap ’90 R20 Suburban. TBI 454/TH400. I’d like to swap out the TH400 for a 4L80e. What’s all involved in something like this? I’ve already got the electronic speedo seeing as how the Sub is a ’90. Do I just need a harness/ECM out of a ’91? Anyone done this before?

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