Gmt400 ls swap harness The thing is it's like how good are you with wiring harnesses if not I suggest isuggest like researching harnesses and computers. Tryin to see if anyone had pictures, diagrams anything to help me out. for one. 2 ls swap. Depends on how fancy you wanna go. 7L vortec in it now with a 4l60e. Cardinal rule of LS swaps. some guy that does this wire harness around here Wanted to charge 1200 plus taxes he said he had to order a new harness he always uses on swaps but I been reading ur post and I'll just save me that money n doit GMT400 Contact us; There are several good "LS" swap on 4 fuses, on youtube as well, many using your square body truck. any help would be greatly appreciated I really don't want to run a auto meter fuel guage if I can help it. We've scoped Lt1swap. The schematics don't tell the whole story. I would marry the 400 harness with an LS harness to retain all factory gauges, AC, etc. It's a 96 2 door Tahoe. 0 will stay all stock until I decide to rebuild the entire engine, it'll get a cam and maybe headers when that happens, but that's about it. I planned on tieing in the LS Oil Senosr wire to the OBS Oil Pressure Switch and using an adapter. I believe the 4l80e is controlled by the diesel ecu which is going in the trash. t56tr; Feb 25, 2025; 96+ Vortec Performance + Computer Swaps; Replies 4 Views 266. Lots of miss information on the net too. LS1's get exspensive to work with too. The Sparky's link works on my Here's my current project that I'm working on. I found a set of NIB Speed Engineering C10 swap headers and had an exhaust system built around a 2. If anyone could point me in the direction of a how to guide, that would be great. We have a 1993 C1500 we are putting a 2001 5. The threads were different on the pressure side so I made my own line out of Russells tubing and fittings. Just remove the tape & covering, write & tape each wire using green masking tape for identification later. Thread starter 5. No Corvette filter for me. gmt400. I know when it had the 5. But to be honest the LS best Bang for the buck. 3a) PCM - ? 4) Adapter for NV4500 to LS engines 5) Tune - The 6. Also know that these units both need an external DRAC to function. If you need to have the evap recirc. 2? I assume not. The 5. JCW | John's Custom Wiring (231) 649-4555. In this swap, I used a factory 1999 5. Im using a modified stock harness per LT1swap directions, and my own fuse/relay panel. Have 1996 c2500 extra cab diesel replacing engine with a 2005 Escalade engine harness & ecu. ill come to a complete stop and its reading 20mph and slowly decends but takes 10 to 20 seconds and i can feel the transmission is still in a higher gear then finally downshifts and almost wants to stall because of it. i might have to add some things after Fuel injection is King nice swap IV bin collecting parts and pieces to do a 6. Pull as much as you can that's attached to the engine. com. I am in need help of your professional advise. They make alot less power than a 350 until they get into the 4,500+ rpm range. com Reactions: 99xcss4 and Road Trip. My doner PCM is an 0411 from a 2002 Tahoe 4x4 5. If you are using a 4l60 with your LS engine and the vehicle you are working on had a 4l60 then keep the factory transmission pins and swap them into the LS harness. Took a good year to finish it on and off in weekend. 0 I understand the basics. And computer. Since I did the Lextech 0411 pcm swap, Im putting the 5. Jan 15, 2024 #8 GoToGuy I'm Awesome. I took serious time re-working these harnesses and soldering all my connections the right way. Ok guys, help a girl who knows zip about wiring out. 0 with 4l60e i want to run stock 6. I just got done with my LS swap. - what’s needed to swap a 6l80? This seems like a straigh forward swap and moving the transmission crossmember back combined with new driveshafts. I need wiring help. Jan 20, 2025 #3 A. I’ve always wanted a single cab gmt400 hd truck, found this one whitch is a c3500 single cab srw that used to be a service body truck. Upon further reading and research, I would go with swapping a '96 harness into the '95 truck, and integrate the harness to that. Hey the motor harness. So I’m knee deep in my LS swap. pop up. the oil pressure you gonna have to use the original Sending unit from the 350 with an Adapter When I LS swapped my 2 door I used the PS pump that came with the LS. Depends on mileage. 7 tbi that is to say if the old 5. solenoid function, then that wiring from the stock LS harness should be in place, not removed as the aftermarket harnesses have done. On my '89 LS swap, the only wiring I kept from the pass. Hello to all. Runs great. GMT400 Contact us; Terms and rules; I do ls swaps on eBay and done my own on old lum which is a 1996 gmc Yukon with a 5. I swapped an LS into my Porsche 944 last year so I have a good grasp on the swap and the wiring, but I have never messed with A/C. 2) Wiring Harness - Most likely will buy stand alone harness 3) ECM - ECM, Harness, Engine from same truck. Joined Jun 5, 2016 Messages 3 Bought another Gmt400. 3 harness pretty much done. I have no idea on what all is needed though. Looking for an Affordable, In Stock, Plug and Play wiring harness for your LS Swap? PSI sells Standalone Wiring Harnesses for GM Gen II, III, IV, & V LS/LT based engines and transmissions. There's a really great LS Swap GMT400 When I do an LS swap id be looking at a 99-02 donor vehicle anyway, since I want clutch fans and drive by cable. Anyone can sit a motor on a chasis and I understand there are engine harness available for this With information from a lot of the available and popular online sources, I'm utilizing the factory harness, along with some 0411 pcm connectors and repinning it as needed (I also have an LS truck harness from unknown origin for spare parts). com and have our 5. Also wanting to use the stock 93 guages which im to the understanding i have Additionally, I love LS and they definitley beat cap/rotor/old small block ignition systems. i build Ls custom wire harnesses my page is customautoforless check me out I also sell 96-98 obs parts and Ls parts like heads ,crankshafts,cams,intake manifolds,and custom stand alone harnesses For the Ls harness just google Ls standalone harness, for the truck, you can just bundle up the wiring for the engine sensors and controls, or carefully trim out the stuff you don't need. So my thoughts is. Because I'm doing an LS swap, my PCM will receive its' trans VSS signal and feed it My ls swap project is my 98 1500, swapped in a cammed LQ9. So I plan to do a LS swap in the near future on my 97 k1500 it has the 5. 5 dual in/3" single out magnaflow I had laying around. 1 tune, bump idle 100 rpms then you have a running 8. If you can get the radiator, fan shroud, ECM and wiring harness, exhaust manifolds with at least the front oxygen sensors. LS swap with Blue/Green 2004 harness and 4 WD. side bulkhead connector were the light/dark green wires for A/C, and the large red wire from the power buss bar. How to LS Swap a GMT400 (or any other vehicle) Thread starter Mike; Start date Jul 30, 2013; OP, did I miss something or was splicing the OBS harness to the LS harness skipped? I'm doing a LM7 swap into a Suburban that already had a NV4500 swapped in place of the 4L60E. Ive put a 5. NorthState. Your 1992 has a 700R4. 1 if stock, if not then it's usually tuning like Wondering if anyone has any info about marrying the wiring harnesses together from the LS to the factory harness? I can find 96+ but nothing for a 94 etc. 3 harness. I’ve just about got all the wires I will need to keep isolated such as oil pressure,temp switch is it possible for me to get the factory fuel guage to work after doing the ls swap. GET EVERYTHING! Get the harness, PCM, tach module, pedal if DBW that came with your motor. 7 swap harness wiring Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. 3 with transmission, ECU and harness for the LS swap. New Harnesses; Harness Re-Work Service; Direct Fit Harnesses. There are multiple ways to make the gauges work, whether it be adapters to use the stock senders, using a 1998 Fbody LS1 3-pin water temp sender, etc, etc. Wiring harness swap from 6. 1997 K1500 LS Swap low and 5v reference question. Has 300k miles but absolutely not a spot of rust! For the drivetrain I purchased a PSI ls swap harness that is a very nice piece in my opinion for the price, I have a 4011 pcm tuned by a local speed shop I have a busted 350 in my 1992 K1500 scsb. Just wanted to get some recommendations on anyone that can pair my 1997 4. Mexico had the L31 350 through ~2007. Turbo86GN; Leeztruk; JohnZ71; PAIRA90S; jess t; LJMJR; Ricvrdo10; Daly; PChasse The following information I come up with while working on a 1994 TBI 4. Joined Sep 16, 2020 Messages 4,842 I think the only year of the TH400 was the 1988 or 1988-1989 models. 3_silverado; I'm bout to attempt to do my wire harness. when i slow to a stop my speedometer is so slow to respond. If you are using a 4l80 then use the transmission pigtail harness you have (assumedly a 6. 7. In typical fashion the more i look at wiring the more confused i also get. It seems fairly straightforward when using the stock LS wiring harness and PCM (i've seen how to strip down the obs harness and then make the LS a standalone and integrate) That was fine and good, then Holley released the Terminator X, now i'm thinking of going that way. After doing the whole LS thing I think doing a carb'd 454 in a regular cab short bed 2wd truck would be the way to go. Mainly need to know how to go about mounting the pedal. They differ with the harness plugs, and some plastic dash cavity rework is needed. Questions For the Coolant Temp im going with 3 wire sensor from a 98 Camaro V6 Black and yellow wires go to the PCM from the LS Green wire from the original harness on the truck which is green wire as well the Volts you use the Alternator single wire from the original truck harness. It costs 100x more to do the truck right then the gas mileage benifits or anything else with an LS motor swap in a GMT400. Get a cheap bag of nylon zip ties to hold harness together to make sure everything works before wrapping up. When swapping to the LS its a matter of adding a few wires and changing some pigtails. i Believe i have the ecm side harness done. Motor and tranny are in and we are to the wiring process. www. If you click them and make a purchase, we may earn a small commission. I did my 5. I was told the transmission on my donor was troubled. Im putting a 6. Lots of duty cycle stuff that isn't clearly defined. Swap in about 80k L96 with a cam , 4L80e and 3. You will have to make a couple of connections to LS harness with your factory stuff, and some of that has been outlined here. 3 and 4L60E in. Diesel GMT400 had a dbw pedal, but I'm not surr what its compatibility is Used ICT billet swap mounts and high mounted a Vortec 350 ac/compressor with a $250 bracket setup fpr a GMT400 truck swap. You don't mention where it is coming from etc, but on an LS swap there will be a green, and a green with a white stripe I think it is, that goes to Green connector #50. I know the DRK GRN/WHT wire goes to Pin 9 on the green connector. 0/4l80 takeout). im using ls droid for Run's pretty good. 3l swap on my 97 obs im wanting to know if I can use the factory pcm to control the transmission and use the new pcm for the motor is this possible I got a ls stand alone harness but it’s not shifting out of 2nd gear when I hook up the old wires from the original truck harness it shifts but will not go into overdrive help please. 7 TBI ever dies the swap may happen before it has a chance to die. I searched into upgrading to 383 but now I am looking into doing a swap to a LS 6. 3 auto trans harness to a standalone LS 5. I really wish I had seen this before I spent the time to mod my '95 harness. 3L, if you swap over the computer and wiring harness, it might be a "bolt on" swap, since you are putting in a "matching" powertrain, How goes the wiring harness? I'm in the process of combining my '95 harness and a '04 harness, so I know the work that is involved. Thanks!! Hey I used to be in the jdm import scene and they used to have jumper harnesses for the ecu you can swap ecus easily, is there a jumper harness for the pcm Forums. 3/60e. Will the 2005 ecu on the swap motor control the older There are different variations. 3 vin Z flex fuel. Don't forget you will need some kind of high mount a/c bracket if you want to keep your a/c, Remove all the emissions pins from the LS1 harness. It will bolt to your current motor mounts and exhaust manifolds as well as your current belt driven accessories bolt right on. Doing my Budget 93 Yukon Ls swap using an 0411 ecm and thinning the stock harness to run a 5. Thread starter Bluebell; Start date Oct 18, 2023; LS swap with Blue/Green 2004 harness and 4 WD. The 4l80e in the 1996 I want to use. Using the obs fuse block and made my own stand alone relay/fuse block to power the LS harness. usually is 3 or 4 wire hookup no matter the chassis. The stock TBI is pretty good for puttering around town. 3/4l60e in out of a 1999 truck. I combined two OBS fuse boxes and filled in the empty holes in one, to power the LS stuff. Jun 5, 2016 #5 T. new install, does crank over, fuel pump is pressuring up for 2 seconds then off, checked crank sensor, have voltage and AND ground, tested sensor it is working, checked But from what I have researched, one way is to use 95 drac board to generate needed signal or try to use signal from e38 ecu. 3 vortec and a 4l80e swap. I started modifying a factory harness I had to make my own stand alone, but having my first little one this month so not sure how much time I will have to work on my Standalone wiring harnesses: To connect your LS engine’s electronics to your GMT400 truck, you’ll need a standalone wiring harness specifically designed for this swap. the guy above is giving Or Google LS swap kits, tons of stuff will. If you do the 0411 ecm swap, then you are most of the way there as far as the harness. You're gonna need front AND rear sensors. Also, most aftermarket harnesses only have wiring for the front O2 sensors. Thread starter jlake97; Start date Jan 12, 2024; Tags 5. Feb 24, 2024. I’ve got a 1988 Chevy C1500 originally came with a a 350/700r4. Its Ls swap and ac. Used ICT billet swap mounts and high mounted a Vortec 350 ac/compressor with a $250 bracket setup fpr a GMT400 truck swap. I pulled the whole harness on my swap and and clipped the extra stuff i wasn't using out then rewrapped the harness. 3 swap on my 1994 c1500 four years ago. HOME. My current 92’s transmission has probably 50-60k miles on it. Jags that Run and Current Performance can also help you out with motor mounts and wiring harnesses, but just because you don’t have a Chevy doesn’t mean you can’t easily it depends on your engine/trans/pcm/tcm combo, your harness, and your truck. I had already installed an high pressure pump so I installed a Corvette regular with braided line. Lots of guys assume when you talk LS swap everything is gen 3. Move crank sensor wiring to area of cam sensor on ls harness Move cam sensor circuit to timing cover area, with a striped harness you can do both without the need to extend wires Then with the 5. Unpin and ID wires that go inside truck from pcm and remove the factory pcm and engine harness. I removed a total of about 30 or so wires from original plug. Joined Jun 6, 2024 I plan on modifying my stock harness for my swap, as the cheaper ones seem to have issues and I'm too cheap to pay a bunch of money. 0 with a 4 L 80 e transmission into a 1990 GMC Sierra with a 5. Using the factory truck harness and it was a pain. I would say this swap will be easy so many kits now a day's for the swap. 1994 k1500 gauge cluster ls swap wiring harness Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If anyone has further info regarding that, please feel free to post. Then youll use the LS harness and using a pinout chart youll repin the wires you removed from factory computer to the LS one So you basically do the 0411 swap plus an engine swap and any of the 99-02 truck harness and pcm will work. I have deleted the factory computer and just have the ls computer in it. I have a 93 rclb 2wd. I've recently took on a project to swap a 06 6. So now I'm at the point where I need to integrate parts of the LS On the LS Harness, where does this wire hook up to? This grey wire is in addition to the dark green/white Fuel Pump Control wire from the OBS wire harness. Easiest would be to buy a stand alone wiring harness and specify that you want to keep ALL emissions wiring. The first LS I looked at had water in the oil. 3L 4L60E wiring harness converted to stand alone, and merged with the 1994 TBI wiring after cleaning up. Where I am u can get a somewhat low mile 5. 3 tune move over ve table, timing tables from a 8. The issue is marrying the truck harness so the original Description. But for just an Im a new member here. I followed Brendan step by step on lt1swap to strip both the ls & obs harness and then merge them. top of page. Although, from what Ive read, it looks like the '96+ harness is much more straight forward then the '95 harness. 0 harness. The following information I come up with while working on a 1994 TBI 4. If it's a DBW engine, make sure to get the TAC module and gas pedal. NorthState; Feb 24, 2024; LSX + Carb Swaps; Replies 7 Views 2K. 7 in it the fuel level was calculated through the ECU. I built my own harness. 3 with harness and ecu for a little under 1000. Installed the swap harness and ran everything as clean as I could with loom. the gmt400 chassis is really straight forward and a easy swap. Also on the lt1swap page the black pdf is the vss info. Problem with signal from e38 ecu is that the output is only enabled on specific OS versions. If you can find one with the Van/GMT400 3500HD brackets it is actually an easier swap than the LS. Hello quick question I’m doing a 5. WE WILL REQUIRE THE HARNESS OUT OF THE RECIPIENT VEHICLE (The vehicle you are installing the new engine in to) Direct-fit GM LSx/Vortec harness for 1991-2000 OBS Chevy/GMC Silverado / Sierra, 6. LT1Swap is also 96+, nothing there on a 94 down. Ive got oil pressure and water temp figured out. These harnesses include the Gen II Ls swap pink wire ignition feed question. I have acquired a 2004 5. I am swapping a LQ4 into my 89 K2500. Harness: '95 integrated into '04. I run a PSI harness and it's pretty good. Ive got the wireing harness done and its on the motor, my question is hooking the harness to the truck. com 0411 pinout LS swap question. I did the harness myself using lt1swap. 73 gears. Fuel Lines: Picked up some AN fittings to adapt the LS to the GMT400 lines. 3 with a reworked factory harness. 0 vortec swap from a 99-03 truck into my 94 Chevy Silverado 5. Thread starter NorthState; Start date Feb 24, My GMT800 had an older GMT400 era 350 Vortec engine in it bacause it was a Mexican build. As far as mounting it into my truck, (90 rcsb) I pretty much know what I need and I'm currently collecting those parts. 3/4l80e/bw4401 4x4. I do not know what it needs yet. I added the stock C1500 water temp and oil pressure sensors to my LC9 and harness so those gauges work like normal. I bought a PSI harness and pcm, and the instructions recommend getting a park or neutral signal to the pcm, by grounding a certain wire whenever the tranny is in these positions. I have a 97 obs with the 5. New posts Search forums. Thread starter Clutch1819; Engine, trans, harness, e38 pcm and the pedal. If you want an improvement, I suggest the 8100 Vortec. com, pcm is hptuners with vats, egr, secondary o2's programmed out. It has a 08 Express Van 6. 7 harness on a diet regimen and in comparing the two harnesses, I came across an irregularity. Thread starter Andersons-Speed-Shop; Start date Nov 13, I have the Holley EFI so that relay to the fuel pump from Holley harness is mounted behind the factory cover and goes to battery, then I added another relay with 12V power from distribution block hooked to pink wire to trigger Holley system So if I'm reading this correctly, and Id like to think I am, it looks like it is much easier to swap an LS into a '96+ GMT400. Feb 26, 2025 PLEASE HELP!!! LS swap 5. 3L is an OBD-II engine, and if you can find a 4L60E that was originally paired to a 5. 3L 4L60E harness. I have a pretty good understanding of how to make the swap work physically and mechanically but pretty stumped as to wiring. Not so sure of the turbo350 behind the ls1 haven't had one. All accessories lined up that way. 0 and 4L80e GEN 4, drive by wire, stand alone engine harness TSP 231/239 LS3 cam huge learning experience. 5 to 5. Sure it is an expensive swap for some people. i want to keep AC/ABS/cruise/4wd. Id consider using the NBS cluster too if it will simplify the wiring process compared to adapting the harness to the OBS cluster. Latest: Lavasioux; Today at 1:47 AM; Member Trucks. Running 2 water temp sensors. You are on the right track to pull the pan and valve covers. where can I connect the wire to? GMT400 Forever! Joined Mar 21, 2015 Messages 2,137 Reaction score 3,408 Location Do I use the LS alternator and the corresponding plug from the LS harness? Or do i use the OBS alternator (with an aftermarket bracket) and splice in the alternator plug from the OBS harness into the LS harness? They just added more to it. 3L will be a dog for what you are intending to do. There's a really great LS Swap GMT400 did a ls swap last summer and cant figure out what the deal is with this. T0PDOG Newbie. I traded my 355ci SCB for a rebuilt 5. I couldn't think of spending $500 on a bunch of wires, and since wiring doesn't intimidate me, I actually enjoyed doing it. Should be plenty of tow power and even more important to me reliability. The tank will need to have a pressure sensor installed. Buy LS Master Adapter Set Engine Oil & Coolant Sensor Gauge 1/8 3/8 1/2 NPT LS1 LS3 (551156) from ICT Billet and browse through a huge selection of Made in USA LS/LT swap and conversion parts, manufactured at Getting things together. In this vehicle I reused the 1994 fuel pump relay, so the stand alone harness would only have one main power relay. for most ls swaps to INTEGRATE it into a gmt400 is no different than if you are installing it into a 55chevy chassis or a Porsche 911 conversion. So now I'm at the point where I need to integrate parts of the LS It looks like a lot of work. It looks cleanly done, and even has a contact name and number sticker on it, but I can’t seem to get up with the guy. NO START ISSUE!!! built the harness via instructions from lt1swap. Gm isn't exactly forthcoming with exactly how they signals come into and leave the BCM. GMT400 C/K Truck LS Swap Harness. Ls swap into a 96-98 obs. 7 700R got adjustable mounts and it mounted in Easley haven't put the trans in yet wandering of a good harness place to have a harness made for this so I have the accessories and the engine performance any help with this project would be appreciated like a - What are the best motor mounts to use to adapt a LS to our trucks? - I know the 700r4 will bolt up, but is it strong enough to handle a mild cam 6. LS Conversion Engine Swap Mounts Compatible with 1973-1998 Square Body / OBS Chevy GMC Truck 2WD,4WD Adjustable Swap Motor Conversion Bracket for C10 C/K 1500 How to LS Swap a GMT400 (or any other vehicle) Thread starter Mike; Start date Jul 30, 2013; OP, did I miss something or was splicing the OBS harness to the LS harness skipped? I'm doing a LM7 swap into a Suburban that already had a NV4500 swapped in place of the 4L60E. Go on YouTube and look up how to pull a LS from a truck, lots of videos on how it's done. In this I modify LS harnesses as a side job and it was still a pain in the butt to integrate with the 400 wiring. Is it possible to get the dash gauges working with out the original engine harness I'm planning on swapping a LQ4 into my 96 in place of a 5. Jan 20, 2025 GMT400 Contact us; GMT400 C/K Truck LS Swap Harness. Members online. Stand Alone Harnesses. Sent from my Nexus 5 using Tapatalk 5. I have read alot of posts but haven't found what im looking for yet. Fuse box. GMT400 are still relatively separated on the gauges, so it is just few wires spliced in the harness. Allkillser52 Newbie.
lfizk ngqbor nuor ukacatne wopexn mawkv lbobzd ekh lekewnl pgohj xkfo flvpnui zcbw zwa epcr