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#1 |
Registered User
Join Date: Dec 2011
Location: Boise, Idaho
Posts: 572
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Another 4l80 swap.
Hello all,
I have searched and most threads are either hijacked or fizzle out. I have an 89 4wd 5.7 TBI 400 turbo suburban. I want to put in a 4l80. Does anyone have FIRST HAND knowledge of the swap? I know the 91 2500s came with a 4l80. There is one at my pic a part but 2wd. question, what do i need to harvest from it. Wire harness, computer etc??? I know i need to change the output shaft if the donor is a 2wd. What and where can i source an adapter for a 241??? I am sure there are many questions i am leaving out so if you can walk me through this i would be indebted. Thank you in advance Chris |
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#2 |
Registered User
Join Date: Dec 2011
Location: Boise, Idaho
Posts: 572
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Re: Another 4l80 swap.
PS,,
What gear would have come in a 91 5.7 4wd if it had the 4l80. I found an entire truck but the owner has no idea what gear is in it. |
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#3 |
Registered User
Join Date: Dec 2011
Location: Regina, SK, Canada
Posts: 622
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Re: Another 4l80 swap.
I did a 4l80e swap from a 1991 crew into my 79. Here is my swap.
http://67-72chevytrucks.com/vboard/s...d.php?t=537481
__________________
1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4 |
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#4 |
Registered User
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: Another 4l80 swap.
Which 91 is it is it the crew cab square body or is the 88-98 body style?If its the 91 crew cab buy it that has a 4l80e np205 combo plus you could use both axles if you wanted them.To know the factory gears look at the glove box sticker and decode it http://www.sierragear.com/gm-rpo-axl...ation-codes-3/ just remember its a old truck so they factory gear ratio might not be the same as what's in it today.
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#5 | |
Registered User
Join Date: Dec 2011
Location: Boise, Idaho
Posts: 572
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Re: Another 4l80 swap.
Quote:
my 89 and 96 burbs both have a 241. was it only in 91 for a 205?? |
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#6 | |
Registered User
Join Date: Dec 2011
Location: Boise, Idaho
Posts: 572
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Re: Another 4l80 swap.
Quote:
I am going to post on your other thread. |
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#7 |
Registered User
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: Another 4l80 swap.
Yeah the 4l80e np205 was 91 only in the crew cab.
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#8 |
Registered User
Join Date: Dec 2011
Location: Boise, Idaho
Posts: 572
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Re: Another 4l80 swap.
Andrew,
Do you know if the adapter from a 92 and newer will bolt to my older 241? Mine is a passenger drop and all of the newer ones are driver drop. Is there a clocking issue?? If the adapter is the same those transmissions are easier to find. Thanks, Chris |
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#9 |
Registered User
Join Date: Aug 2009
Location: Sunray,TX
Posts: 251
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Re: Another 4l80 swap.
I bought a 5/8 spacer adapter that northwest fab makes for my 400 to 4l80e/ 205 swap. It should eork fine with your 241 setup. It adapts the 400 size index ring to the 4l80e size index ring. I think the adapter was around $150
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#10 |
Registered User
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: Another 4l80 swap.
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#11 |
Registered User
Join Date: Dec 2011
Location: Boise, Idaho
Posts: 572
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Re: Another 4l80 swap.
Thanks for the help. I wish the search feature worked a little better on these sites. All the information is always available but finding it sometimes isn't so easy.
Chris |
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#12 |
Registered User
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: Another 4l80 swap.
I use just google between pirate 4x4,pavement sucks and few other 4x4 forums most stuff is covered somewhere.
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#13 |
Registered User
Join Date: Aug 2009
Location: Sunray,TX
Posts: 251
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Re: Another 4l80 swap.
The only part i still havent found much info on is the shifting linkage. I made a linkage adapter out of a piece of 2" strap that bolts to the old linkage pivot mount on the frame. I also welded on a piece of round stock to extend my original shift linkage. Problem is, i cant shift it manually down past drive(3rd). I read somewhere about putting a "J" bend into to the linkage, but i havent experimented with it too much yet. Also i read that a 700r4 steering column might be needed.
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#14 |
Registered User
Join Date: Dec 2011
Location: Regina, SK, Canada
Posts: 622
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Re: Another 4l80 swap.
A company called lokar makes many trans linkage adapters try a google on that. I believe they have something.
__________________
1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4 |
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#15 |
Registered User
Join Date: Dec 2011
Location: Boise, Idaho
Posts: 572
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answer to my own thread
Hello all,
I thought i would share my 4l80 swap conclusion with the board. First, It was worth every penny. here is the list of things i know to be true now that i did it. 1- my cross member slid back exactly the distance of the bolt spacing. I only had to drill one new hole per side. 2- the 400 turbo trans case adpater will not work, you will need one from a 4l80 3- throw all your linkage in the trash and buy the Lokar rod linkage set up (not cable). worth every penny 4- there are two stock convertor for the 4l80, SB and BB. Use the SB for higher stall speeds. if you trans came from a big block donor it will stall to low for you SB to work well. 5- finding a SB 4l80 dust cover is next to impossible. i had to cut and tig two different covers together. 6 you will need to cut both the trans case shift linkage and the trans case support rod. Easy to do with a few inches of DOM tubing and a welder. 7 the 4l80 dipstick tube from my 93 donor cleared my firewall. 8 the EZ TCU trans controller works well but the programming is archaic and should be an embarrassment to FAST. 9 you can use the rear output speed sensor on the 4l80 for the EZ TCU. I bought a dakota digital but have not installed it. it would only make a difference in low range not using the transcase output. 10 with my two inch lift, i think my original rear driveshaft would have worked. I installed a SYE so i had to make a new rear shaft. 11 you will need a new front shaft. 12 the speedometer cable reached, the 4wd shift indicator wire did not. 13 throw away the steel transmission lines. I used USA made rubber transmission hose and simple automotive hose barb fittings. i used a straight and a 90 on the radiator along with two 45s at the trans. easy, simple if there is a problem any parts house will have more hose. 14 Enjoy the OD. I now run 456 gears and still can cruise at highway speeds. Chris |
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#16 | |
Registered User
Join Date: Apr 2006
Location: Miami now in Vegas
Posts: 828
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Re: answer to my own thread
Quote:
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Long live SLIM ------------------ At least try to buy American ![]() |
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#17 |
Registered User
Join Date: Nov 2014
Location: Alameda, CA
Posts: 877
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Re: Another 4l80 swap.
91 3/4 Suburbans are about like hen's teeth, you're lucky that you found one that still had the parts you needed.
For what EZ TCU costs I'm surprised it's so archaic. Why did you choose it over Microsquirt? You can get that for a few bucks less, plug n play, and I've heard good things about it. I really need to get around to engine/tranny swap in my C20, just need to find the right deal and time to do it.
__________________
1973 C20, 350/350 |
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#18 | |
Registered User
Join Date: Dec 2011
Location: Boise, Idaho
Posts: 572
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Re: Another 4l80 swap.
Quote:
my trans came from a 1993 k3500. Don't even bother hunting for the 1991. there is no need. I had the linkage from a 1991 and still tossed it because it interfered with my exhaust. the dust cover was the no find part. i cut the oil pan section from the 400 turbo and welded it to the 4l80 cover. you could use the big block cover, it is just real big around the oil pan. ![]() My rebuild for the whole truck is here http://67-72chevytrucks.com/vboard/s...50#post7469050 |
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#19 |
Junior Member
Join Date: Jun 2004
Location: Murfreesboro, Tn
Posts: 1,092
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Re: Another 4l80 swap.
i Just parted out a 91 V3500 crew cab with a completely rebuilt 4l80 trans/vss205 with factory adapter and shifter, and have every drive shaft (all 3 ), bracket, nut, bolt, dash cluster, shifter, everything! to do a swap into an older crew. I was going to put it in my 76 crew but i decided its gonna stay original.
Gotta love an OD with 4.56's!! Nice Oh... i think i've got 2 of the 91 dust covers. I'll check that out this weekend.
__________________
1969 impala conv 427 #s loaded. dad bought new 1969 "Judge" RA-3, rare warwick blue/white, #'s 1968 vet convertible #s 427/435 tripower (sold) 1968 belair 2door post #s 427/385 1936 ford 5w coupe dads 1st car 1969 camaro ss (17,xxx) miles Wanted: 69-72 suburban project, 69 camaro convertible. also any big block cars. 69-70 gto judge project. |
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#20 | |
Registered User
Join Date: Dec 2011
Location: Boise, Idaho
Posts: 572
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Re: Another 4l80 swap.
Quote:
let me know,, PM me Chris |
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