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Author Topic: 1991 gm went to the 480le how did they do that?  (Read 4348 times)

Offline pholliday1

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1991 gm went to the 480le how did they do that?
« on: December 14, 2012, 02:00:29 pm »
Interested in the computer/harness differences to upgrade a tbi turbo 400 to 480le.Not sure if gm used a standalone computer for this or upgraded there existing ecm....anyone?
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VETERAN AND LIFETIME NRA MEMBER. WHAT DO YOU STAND FOR?
1991 V3500 CREWCAB SRW 454TBI GMC
1991 v3500 crewcab SRW 454tbi 480le 6" lift
1990 V3500 crewcab Dana 60 FF 14b 5:38 ratio 40 inch 11" lift
1989 v3500 crewcab 454TBI 5" lift

Offline Captkaos

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Re: 1991 gm went to the 480le how did they do that?
« Reply #1 on: December 16, 2012, 01:19:34 pm »
The ECM controlled the 4L80E.  It was a one year only in our trucks and was only available on the 1Ton Crew Cabs.
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Offline zieg85

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Re: 1991 gm went to the 480le how did they do that?
« Reply #2 on: December 16, 2012, 01:37:20 pm »
Wasn't the 91 C2500 Suburban one, the one I parted out sure looked factory
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Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline Captkaos

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Re: 1991 gm went to the 480le how did they do that?
« Reply #3 on: December 16, 2012, 01:58:10 pm »
OOPS! forgot about the Burb's.  Yes it would have been.
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Offline ehjorten

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Re: 1991 gm went to the 480le how did they do that?
« Reply #4 on: December 17, 2012, 09:27:46 am »
I can confirm what Captkaos states!  ;D

Newer trucks now have separate controllers for the transmission and engine.  One major issue with the '91 is there is no support in the tuner world for the 454-4L80e PROM.  MegaShift could be your new friend!
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-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline pholliday1

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Re: 1991 gm went to the 480le how did they do that?
« Reply #5 on: December 17, 2012, 11:54:41 am »
Seems like a little of a stretch you'd almost need a 91 burb donor because chances of finding donor crewcab are really slim.
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VETERAN AND LIFETIME NRA MEMBER. WHAT DO YOU STAND FOR?
1991 V3500 CREWCAB SRW 454TBI GMC
1991 v3500 crewcab SRW 454tbi 480le 6" lift
1990 V3500 crewcab Dana 60 FF 14b 5:38 ratio 40 inch 11" lift
1989 v3500 crewcab 454TBI 5" lift

Offline bluecrew

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Re: 1991 gm went to the 480le how did they do that?
« Reply #6 on: December 17, 2012, 09:11:11 pm »
I have a 91 crew cab.  For the right price, it could be a donor...$$$!
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Offline pholliday1

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Re: 1991 gm went to the 480le how did they do that?
« Reply #7 on: December 17, 2012, 09:50:05 pm »
Ha ha !thank you for your offer , I would dare say 91 crewcabs are few and far between especially as nice as ehorten.
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VETERAN AND LIFETIME NRA MEMBER. WHAT DO YOU STAND FOR?
1991 V3500 CREWCAB SRW 454TBI GMC
1991 v3500 crewcab SRW 454tbi 480le 6" lift
1990 V3500 crewcab Dana 60 FF 14b 5:38 ratio 40 inch 11" lift
1989 v3500 crewcab 454TBI 5" lift

Offline ehjorten

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Re: 1991 gm went to the 480le how did they do that?
« Reply #8 on: December 18, 2012, 01:44:30 pm »
Searched for 3 years for mine...across the country and in the end this one ended up within 1 hour of my home town! :)  Needless to say...I never moved so fast!  Thanks for the compliments.  It isn't without it's flaws...but I enjoy working on it and driving it!
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-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline bluecrew

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Re: 1991 gm went to the 480le how did they do that?
« Reply #9 on: December 18, 2012, 06:55:29 pm »
Quote from: pholliday1 on December 17, 2012, 09:50:05 pm
Ha ha !thank you for your offer , I would dare say 91 crewcabs are few and far between especially as nice as ehorten.
Agreed, his IS one heII of a crew.  Kind of a pipe dream for the rest of us, but sure is nice to look at, no matter how jealous it makes me.
« Last Edit: December 19, 2012, 09:19:28 am by bluecrew »
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Offline Captkaos

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Re: 1991 gm went to the 480le how did they do that?
« Reply #10 on: December 23, 2012, 12:49:43 pm »
They used the same standalone computer up to about 1993, so you aren't limited on your sources.
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