4L80E and case ???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

6600DURAMAX · 03-27-2014, 10:28 PM

Just bought a 2003 6.0/4l80e and whatever case is behind it. Found a guy that has a factory 4l80e and 205 from a late 90's truck. I need the pass drop for my next project. Questions will the 4l80e computer work with the older transmission???? Hope all that makes sense. I would like just to plug my 2003 transmission harness into the older 4l80e...

Vintage Windmills · 03-28-2014, 01:23 AM

chevy's didn't have an np205 since sometime in the 80's. I think 93 dodge 3/4 an 1 tons were the last production vehicles to get them.

6600DURAMAX · 03-28-2014, 06:13 AM

http://www.alaska4x4network.com/showthread.php?t=60727

They did come one year in the 1990 v3500 in that config. Just not sure if the electronics will work with the 2003

Vintage Windmills · 03-28-2014, 09:03 AM

Good info, will keep that in mind when I'm in the scrap yards. so do you figure his combo is from a early 90's v3500 and not from a late 90's?

Bill72 · 03-28-2014, 12:22 PM

1991 was the last year of the np205 and the first year of the 4L80E for GM. So that is the only year you could get that combo from the factory. Also it was the last year of the V trucks. If you wanted the 454 TBI and 4L80E and the np205 from the factory, the only truck to ever have that was the 1991 V3500 crewcab.

6600DURAMAX · 03-28-2014, 09:07 PM

Now I just need to know if it will work with my 2003 wiring harness. Anyone???

Motoxrrar · 03-28-2014, 09:15 PM

I don't think it will. There were some mechanical differences that would not shift the same. I don't remember exactly but I had done some research on them years ago. Gm made 3 different 4l80e. I have both the early and late models right now. But you would run into two issues, one being a starting problem with the pcm. If it did start and go then you would most likely burn up the tranny or have shifting problems.

I am no expert but if my memory serves me correct.. Id say its a no go.

Motoxrrar · 03-28-2014, 09:22 PM

Hope this helps

OldCreek · 03-29-2014, 01:09 PM

Jake's Performance has a Faq page. It doesn't come out and say it but it implies that older cores are used with newer LS engine…thereby implying that, yes, an older core will work with a newer computer….

The Neutral Safety switch may be an issue depending on the year of core.

http://www.jakesperformance.com/4L80E_FAQ.html

OldCreek · 03-29-2014, 01:13 PM

You could always use the original 4l80e from the 6.0 and buy an adapter to fit a 32 spline input np205…. (there's a ton of different scenarios you could run)

http://www.pirate4x4.com/forum/motor...ngagement.html

03-27-2014, 10:28 PM	#1
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,107	4L80E and case ???? Just bought a 2003 6.0/4l80e and whatever case is behind it. Found a guy that has a factory 4l80e and 205 from a late 90's truck. I need the pass drop for my next project. Questions will the 4l80e computer work with the older transmission???? Hope all that makes sense. I would like just to plug my 2003 transmission harness into the older 4l80e... __________________ 1972 K5 Build - plans - LS3-6L80e-One Tons..... 1971 CREWMAX Build.....at body shop for couple more years

03-28-2014, 01:23 AM	#2
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: 4L80E and case ???? chevy's didn't have an np205 since sometime in the 80's. I think 93 dodge 3/4 an 1 tons were the last production vehicles to get them. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

03-28-2014, 06:13 AM	#3
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,107	Re: 4L80E and case ???? http://www.alaska4x4network.com/showthread.php?t=60727 They did come one year in the 1990 v3500 in that config. Just not sure if the electronics will work with the 2003 __________________ 1972 K5 Build - plans - LS3-6L80e-One Tons..... 1971 CREWMAX Build.....at body shop for couple more years

03-28-2014, 09:03 AM	#4
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: 4L80E and case ???? Good info, will keep that in mind when I'm in the scrap yards. so do you figure his combo is from a early 90's v3500 and not from a late 90's? __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

03-28-2014, 12:22 PM	#5
Bill72 Registered User Join Date: Feb 2008 Location: Fort Sumner, NM Posts: 298	Re: 4L80E and case ???? 1991 was the last year of the np205 and the first year of the 4L80E for GM. So that is the only year you could get that combo from the factory. Also it was the last year of the V trucks. If you wanted the 454 TBI and 4L80E and the np205 from the factory, the only truck to ever have that was the 1991 V3500 crewcab. Attached Images

03-28-2014, 09:07 PM	#6
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,107	Re: 4L80E and case ???? Now I just need to know if it will work with my 2003 wiring harness. Anyone??? __________________ 1972 K5 Build - plans - LS3-6L80e-One Tons..... 1971 CREWMAX Build.....at body shop for couple more years

03-28-2014, 09:15 PM	#7
Motoxrrar Registered User Join Date: Feb 2014 Location: Tennessee Posts: 282	Re: 4L80E and case ???? I don't think it will. There were some mechanical differences that would not shift the same. I don't remember exactly but I had done some research on them years ago. Gm made 3 different 4l80e. I have both the early and late models right now. But you would run into two issues, one being a starting problem with the pcm. If it did start and go then you would most likely burn up the tranny or have shifting problems. I am no expert but if my memory serves me correct.. Id say its a no go.

03-28-2014, 09:22 PM	#8
Motoxrrar Registered User Join Date: Feb 2014 Location: Tennessee Posts: 282	Re: 4L80E and case ???? Hope this helps Attached Images

03-29-2014, 01:09 PM	#9
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Re: 4L80E and case ???? Jake's Performance has a Faq page. It doesn't come out and say it but it implies that older cores are used with newer LS engine…thereby implying that, yes, an older core will work with a newer computer…. The Neutral Safety switch may be an issue depending on the year of core. http://www.jakesperformance.com/4L80E_FAQ.html __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263

03-29-2014, 01:13 PM	#10
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Re: 4L80E and case ???? You could always use the original 4l80e from the 6.0 and buy an adapter to fit a 32 spline input np205…. (there's a ton of different scenarios you could run) http://www.pirate4x4.com/forum/motor...ngagement.html __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263



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