90 vs 91 ECm's - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ponjohn · 01-08-2008, 04:11 AM

For the 3/4 ton Suburban, was it the first year for the 4l80e?

If so, would it be feasible to buy a 91 ecm with trans harness and install the 4l80e in a pre91 equipped with TBI?

TIA-
John

cartman · 01-10-2008, 04:06 PM

I believe that 93' or 94' was the first year of the 4L80. never available in the old style truck as far as I know, I would buy a stand alone controler, available at summit ETC They had throttle bodys up to and including 95' but I don't know if a ECM from a newer style would work?

ponjohn · 01-11-2008, 11:45 AM

cartman- thanks...I saw a 91 for sale and it said OD.

The truck appeared to be all original so I thought that if it was the first year it would be an easy swap

cartman · 01-11-2008, 01:12 PM

Probably has a 700r4, that would be "od"

ponjohn · 01-11-2008, 01:59 PM

Probably swapped....thanks-
john

**Captkaos** · 01-17-2008, 12:15 PM

Quote:

Originally Posted by ponjohn

For the 3/4 ton Suburban, was it the first year for the 4l80e?

If so, would it be feasible to buy a 91 ecm with trans harness and install the 4l80e in a pre91 equipped with TBI?

TIA-
John

1991 was the only year for the 4L80E our bodystyle, it was only available on the 1Tons as far as I know, but it could have been on 3/4T. The ECM has the controls for the 4L80E built in, so yes could use it in a 87-90 with TBI if you have the harness....

ponjohn · 01-17-2008, 03:26 PM

Appreciate the info...I am watching a few on ebay...there is a 90 locally that needs a trans. (t400 is gone...sounds like front pump).

John

ponjohn · 01-27-2008, 10:36 AM

Does anybody have the ECM number for the 1991, 454, 2wd with 4l80e?

Thanks-
john

extd56 · 02-13-2008, 07:21 AM

1991 was the first year to use the 4L80e. It was used I knmow for sure in the 3/4 Suburbans and the 1 ton trucks. I have parted out 3 of the burbs and they were all 3/4 ton and all had the 4L80e trnas, 2 were small block and 1 big block 2 wheel drive. I will see if I can find the right computer from the big block. I know I have all the wiring from the small block that had the 4L80E, not sure what the difference was betwen them.

**Captkaos** · 02-13-2008, 08:47 AM

The ECM on the 4L80E is 16147060, same as what was on the 1993 454SS.

extd56 · 02-13-2008, 09:05 AM

IS the ECM the same on the big block and the small block with the 4L80E?

ponjohn · 02-13-2008, 10:01 AM

Quote:

Originally Posted by extd56

1991 was the first year to use the 4L80e. It was used I knmow for sure in the 3/4 Suburbans and the 1 ton trucks. I have parted out 3 of the burbs and they were all 3/4 ton and all had the 4L80e trnas, 2 were small block and 1 big block 2 wheel drive. I will see if I can find the right computer from the big block. I know I have all the wiring from the small block that had the 4L80E, not sure what the difference was betwen them.

Let me , I'd be happy to purchase whatever you have, even just the harness for the trans.

The 7060 is now superceded by 88999179, if buying from GM.

The schematic shows gas w/4l80 and gas w/o 4l80. The prom prob has a diff prgram for the larger cubic inch. I would say same ecm.

extd56 · 02-13-2008, 01:20 PM

I took out the entire harness from the 91 Burb, do you need all the harness for thew swap or just the engine and trans computer wiring for the ECM?

ponjohn · 02-13-2008, 08:28 PM

Quote:

Originally Posted by extd56

I took out the entire harness from the 91 Burb, do you need all the harness for thew swap or just the engine and trans computer wiring for the ECM?

Engine, trans harness, ecm and DURAC if you removed it.

Pm me with a price.

John

extd56 · 02-13-2008, 10:47 PM

Quote:

Originally Posted by ponjohn

Engine, trans harness, ecm and DURAC if you removed it.

Pm me with a price.

John

What is DURAC?

ponjohn · 02-14-2008, 12:27 AM

It generates the digital speed signal. It is generally located next to the ecm, smaller box. The 90 has one but it is slightly different from the 91. Might be able to use the 90.

john

extd56 · 02-14-2008, 01:11 AM

Here are some pics of the engine and transmission harness. It came out of a 1991 Suburban 3/4 ton 4x4 that had a 350 engine with a 4L80E trans. The engine had a knock on it and I am using the trans in my crew cab project. I can do 220.00 for the harness and computer and 20.00 for shipping. It looks like 2 wires were cut, they are shown in the picture.

**Captkaos** · 02-14-2008, 02:29 AM

Quote:

Originally Posted by extd56

IS the ECM the same on the big block and the small block with the 4L80E?

ECM is the same, PROM is different.
You want the DRAC = (Digital Ration Adapter Controller) it should be located under the dash below the radio (little white box). It usually is just clipped there
If you already have one you just need to recalibrate it, or you could ditch it and use a VSS.

Found the link for calibrating...http://www.614streets.com/drac.html

dmsteele92831 · 03-24-2008, 06:49 AM

Sorry to revive this, but I just bought a 1/2 ton 91 burb SLE and it has the 4L80E. It also has about almost every other option on it so maybe that trans was a special order for the 1/2 ton???

01-08-2008, 04:11 AM	#1
ponjohn Registered User Join Date: May 2002 Location: woodbridge, ct. usa Posts: 145	90 vs 91 ECm's For the 3/4 ton Suburban, was it the first year for the 4l80e? If so, would it be feasible to buy a 91 ecm with trans harness and install the 4l80e in a pre91 equipped with TBI? TIA- John

01-10-2008, 04:06 PM	#2
cartman Registered User Join Date: Dec 2007 Location: Gloucester, Massachusetts Posts: 49	Re: 90 vs 91 ECm's I believe that 93' or 94' was the first year of the 4L80. never available in the old style truck as far as I know, I would buy a stand alone controler, available at summit ETC They had throttle bodys up to and including 95' but I don't know if a ECM from a newer style would work?

01-11-2008, 11:45 AM	#3
ponjohn Registered User Join Date: May 2002 Location: woodbridge, ct. usa Posts: 145	Re: 90 vs 91 ECm's cartman- thanks...I saw a 91 for sale and it said OD. The truck appeared to be all original so I thought that if it was the first year it would be an easy swap

01-11-2008, 01:12 PM	#4
cartman Registered User Join Date: Dec 2007 Location: Gloucester, Massachusetts Posts: 49	Re: 90 vs 91 ECm's Probably has a 700r4, that would be "od"

01-11-2008, 01:59 PM	#5
ponjohn Registered User Join Date: May 2002 Location: woodbridge, ct. usa Posts: 145	Re: 90 vs 91 ECm's Probably swapped....thanks- john

01-17-2008, 03:26 PM	#7
ponjohn Registered User Join Date: May 2002 Location: woodbridge, ct. usa Posts: 145	Re: 90 vs 91 ECm's Appreciate the info...I am watching a few on ebay...there is a 90 locally that needs a trans. (t400 is gone...sounds like front pump). John

01-27-2008, 10:36 AM	#8
ponjohn Registered User Join Date: May 2002 Location: woodbridge, ct. usa Posts: 145	Re: 90 vs 91 ECm's Does anybody have the ECM number for the 1991, 454, 2wd with 4l80e? Thanks- john Last edited by ponjohn; 01-27-2008 at 10:37 AM.

02-13-2008, 07:21 AM	#9
extd56 Senior Member Join Date: Nov 2004 Location: Vacaville, CA Posts: 2,272	Re: 90 vs 91 ECm's 1991 was the first year to use the 4L80e. It was used I knmow for sure in the 3/4 Suburbans and the 1 ton trucks. I have parted out 3 of the burbs and they were all 3/4 ton and all had the 4L80e trnas, 2 were small block and 1 big block 2 wheel drive. I will see if I can find the right computer from the big block. I know I have all the wiring from the small block that had the 4L80E, not sure what the difference was betwen them.

02-13-2008, 08:47 AM	#10
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: 90 vs 91 ECm's The ECM on the 4L80E is 16147060, same as what was on the 1993 454SS. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

02-13-2008, 09:05 AM	#11
extd56 Senior Member Join Date: Nov 2004 Location: Vacaville, CA Posts: 2,272	Re: 90 vs 91 ECm's IS the ECM the same on the big block and the small block with the 4L80E?

02-13-2008, 01:20 PM	#13
extd56 Senior Member Join Date: Nov 2004 Location: Vacaville, CA Posts: 2,272	Re: 90 vs 91 ECm's I took out the entire harness from the 91 Burb, do you need all the harness for thew swap or just the engine and trans computer wiring for the ECM?

02-14-2008, 12:27 AM	#16
ponjohn Registered User Join Date: May 2002 Location: woodbridge, ct. usa Posts: 145	Re: 90 vs 91 ECm's It generates the digital speed signal. It is generally located next to the ecm, smaller box. The 90 has one but it is slightly different from the 91. Might be able to use the 90. john

02-14-2008, 01:11 AM	#17
extd56 Senior Member Join Date: Nov 2004 Location: Vacaville, CA Posts: 2,272	Re: 90 vs 91 ECm's Here are some pics of the engine and transmission harness. It came out of a 1991 Suburban 3/4 ton 4x4 that had a 350 engine with a 4L80E trans. The engine had a knock on it and I am using the trans in my crew cab project. I can do 220.00 for the harness and computer and 20.00 for shipping. It looks like 2 wires were cut, they are shown in the picture. Attached Images

03-24-2008, 06:49 AM	#19
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Re: 90 vs 91 ECm's Sorry to revive this, but I just bought a 1/2 ton 91 burb SLE and it has the 4L80E. It also has about almost every other option on it so maybe that trans was a special order for the 1/2 ton??? __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi



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