`91 3/4t 4L80E control questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**special-K** · 01-05-2005, 11:11 AM

1)Is anyone familiar with how the 4L80E is controlled on a`91 diesel Suburban (92/93?)since the motor is not ECM-controlled?I`m wondering`cause I`d like to do a swap to a`72 and this would be the best candidate.I suppose if I find a donor,I would just take the harness and whatever is attached to it.2)Or,is there a way to convert a 4L80E to manual control.Then I could use other 4L80Es.3)Is there a company that makes an install kit for using these trannies in early-models or street rods?

grape · 01-05-2005, 01:16 PM

Jet, TCI, Compushif, and PCS all make stand alone controllers. I'm sick in the head and play with the diesels.........the 91-93 trucks had a separate controller to run the trans, however I'm sure you don't want your wide open shift points to be 3400 rpm. I have never had one of the boxes in my hand but they do have a chip, which I assume would be reprogramable by someone waaaaaaaay smarter than myself.

**special-K** · 01-05-2005, 07:32 PM

Hey Grape,I recognize you from The Diesel Page.I`m CK Piquup over there.I don`t know,I just thought I`d have a different name here.Nothing shady.

01-05-2005, 11:11 AM	#1
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	`91 3/4t 4L80E control questions 1)Is anyone familiar with how the 4L80E is controlled on a`91 diesel Suburban (92/93?)since the motor is not ECM-controlled?I`m wondering`cause I`d like to do a swap to a`72 and this would be the best candidate.I suppose if I find a donor,I would just take the harness and whatever is attached to it.2)Or,is there a way to convert a 4L80E to manual control.Then I could use other 4L80Es.3)Is there a company that makes an install kit for using these trannies in early-models or street rods? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

01-05-2005, 07:32 PM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Hey Grape,I recognize you from The Diesel Page.I`m CK Piquup over there.I don`t know,I just thought I`d have a different name here.Nothing shady. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

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01-05-2005, 01:16 PM	#2
grape Registered User Join Date: Dec 2003 Location: Ft. Worth, TX Posts: 86	Jet, TCI, Compushif, and PCS all make stand alone controllers. I'm sick in the head and play with the diesels.........the 91-93 trucks had a separate controller to run the trans, however I'm sure you don't want your wide open shift points to be 3400 rpm. I have never had one of the boxes in my hand but they do have a chip, which I assume would be reprogramable by someone waaaaaaaay smarter than myself.



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