Gmt 400 ls swap

The oil pressure gauge and coolant temp will reuse the existing sensors/wiring you will just need adapters for the 6.0 threads/ports. Speedometer should be one wire output from the 6.0 ecm that connects to one wire from the DRAC box behind the glove box (may have to adjust output from the 6.0 ecm).

TECH ARTICLE. LS Swap into 88-98 GM Truck. We have always wanted to build a 88-98 sport truck, and with the popularity of these trucks coming back, now was the perfect time. At the moment, these trucks are relatively cheap to pick up, and can be found with full power, AC, tilt, etc.Are you tired of spending a fortune on accommodations every time you go on vacation? If so, vacation home swapping might be the perfect solution for you. By exchanging homes with a...Running an LS swap in my truck. Run's pretty good. Sure it is an expensive swap for some people. The stock TBI is pretty good for puttering around town. But to be honest the LS best Bang for the buck. The thing is it's like how good are you with wiring harnesses if not I suggest isuggest like researching harnesses and computers.Aug 10, 2013 · Older OBS to LS wire harness setup. I have. A 1994 c1500 w/t that had the old 4.3 in it. I have the 5.3 dropped I with my 4L60 behind it. The guy from LT1 swap.com already did the pcm reprogrammig. Now for the harness !! I have trimmed it down like he stated in the lt1swap.com website. Been looking up and down the internet and I've found plenty of LS swap kits, but so far nothing 4X4 for the 88-98 trucks. Can anyone give me a lead on where to get a kit or any 4X4 specific parts? This would be for the same bone stock 91 K1500 mentioned in older posts of mine. Nov 29, 2016 #2 GreenChevelleSS

LOW BUDGET LS swap AC relocation brackets, VERY NICE factory looking install. Thread starter K30burb; ... and looks very factory. this kit is designed specifically for gmt 400 trucks, but could be fit to other non gm vehicles with ls swaps. most of the ac relocation kits on the market are $1000. and up. I am trying to keep mine very …Ls swap headers . Any recommendations on long tubes for my 95 k1500 lq4 swap? Will gmt800 long tube fit? comments sorted by Best Top New Controversial Q&A Add a Comment Jester1614 • Additional comment actions. Truck will ...I bought the 92 when I was 17, I'm 38 now, and they'll bury me in this truck. But it does need some love. She's all original and showing her age. When I priced out everything to rebuild, roller cam, ebl flash 2, throttle body stuff, etc.. to get her a little more pep you're spending as much as an LS swap. That's not even including new heads.Bumping this as I am in the same situation. LS into 1996 K1500 with push button t-case AWD/4WD. I can have LS ECM or the vortec OE ecm control the 4L60E trans. I kept the entire vortec harness intact. Just like OP, I need to know what to do with the wires from the firewall to/from body control module/dash. Mar 26, 2024.Ultimate GMT400 LS Swap Guide. I. Development and Design of the GMT400 A. Background and Origins. In the early 1980s, the truck market was rapidly …ls 6.0 4l80e swap. Thread starter El chiwas; Start date Feb 1, 2022; Tags #engineswapinfo #6.0l96 #obschevy ls swap Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission. Feb 1, 2022 #1 E. El chiwas ...I have done 4 ls swaps into gmt400's. 3 of them were into 1998 trucks. one was a 1994. there are various ways to do it. depending on the truck and the final outcome you are wanting. 2 of the 98's I left the original 5.7 vortec harnesses installed in the trucks and double sensored the ls engine so the dash gauges would work and the ls was stand alone but still controlled the 4l80e's in both ...

LS fuel system swap guide for OBS 1988 to 1998 Chevy and GM K1500 / C1500 trucks. This fuel system swap guide will show you all of the parts needed to …Apr 6, 2023 · LS Swap Longtube Headers 1 7/8. (In Stock) Speed Engineering LS Swap Longtube headers are made out of 304 stainless steel and offer great quality, performance, and affordability. Our LS swap longtube headers are mandrel bent, tig welded, and feature natural stainless steel construction. Nov 19, 2020 ... How To Get Your LS Swapped OBS Gauges To Work. I also have a video of where to move all your wires to complete the swap.Nov 18, 2020 ... We show some part #'s and my a/c setup on my ls swapped obs chevy in hopes to help you folks out that are looking for the same info I was ...Eastern North Carolina. Cardinal rule of LS swaps. GET EVERYTHING! Get the harness, PCM, tach module, pedal if DBW that came with your motor. Get it all! I’m in the process of working through my first swap. Even with limited auto electrical experience, the concept should be doable. I ended up with a freshened up 5.3 with a cam/spring kit.

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1996-2000 OBS / GMT400 Gen3 LS Swap Info. Here I will go over a swap I completed on a 1998 C1500 pickup. It originally had a 4.3L Vortec and swapped to a 2005 5.3L LM7 with drive by wire. I will go over the way I did the harness integration to all factory functions on the 1998. AC, Cruise, all gauges, so on. Fitting a classic car or hot rod with a newer LS or LT V8 engine poses many challenges, including a gauge cluster in most cases. While there are many different routes builders can take to solve ...The 4l80e bone stock will handle any abuse a stock 6.0 can throw at it. If not then L96 + 6Lxx tranny, the L96 and 6l90 will probably take more work to integrate, so it'll be more expensive. The 6l90 (or 80) would just be awesome in a gmt400. As long as they're tuned well they're supposed to be stout. May 29, 2020. #9.so ive swaped a 2002 4.8 out of a p/u into a 98 p/u. i used all the 2002 pcm, harness & uhfb. started the truck today & all went well except the temp & fuel gauges dont work {kinda figured} i was going to put the 98 water sending unit in the pass side head and be simple but it doesnt come close to fitting in that little hole in the ls head so i ...Now I want to turn these ideas into a reality. First of all, there is a lot that I am unsure of when it comes to the LS swap everyone (especially myself) drools about. 1) LQ4 6.0 Engine - 2002 or older - as to not screw with drive by wire. 3) ECM - ECM, Harness, Engine from same truck.

1996-2000 OBS / GMT400 Gen3 LS Swap Info. Here I will go over a swap I completed on a 1998 C1500 pickup. It originally had a 4.3L Vortec and swapped to a 2005 5.3L LM7 with drive by wire. I will go over the way I did the harness integration to all factory functions on the 1998. AC, Cruise, all gauges, so on. LT1Swap.com was already mentioned, but as spoke of, has a ton of info for wiring your "LS" type engine. Your can do it with four fuses and tie into your harness. Yes, locate and re-use your temp and oil sensors for the dash as the donor engine has two locations for temp sensors. Leave the Temp sensor for you engine in place, but go to opposite ... Reaction score. 10. Location. Mississippi. Ok guys, I’ve looked threw all 298 pages on the maintenance manual for the wiring on a 92 and searched the inter webs. I know I’m just missing it but I’m labeling the wires I need to keep in the white plug harness that goes threw the firewall on the passenger side and mounts behind the glove box.GMT-400 5.3 push button 4wd swap. Been working on a 5.3 swap for the old Yukon. Truck has a lot of memories for me and my wife, and is lovingly named Jackson. Yes, a male. 1993 Yukon with 330k hard long miles. I bought a 2005 GMC Sierra for $1400 that came with a PSI harness and a set of dirty dingo engine mounts.25. Reaction score. 14. Location. 32735. I'm swapping a new motor into my 98 k1500 as the stock 5.7 Vortec started knocking right after I was done putting a new tranny in and I'm at a crossroads. I have access to two motors. One is an aluminum block 5.3 …Honestly, if you are a Facebook user, there's a great OBS LS swap group on there with tons of great info. For headers look at the Schoenfeld LS swap headers (PN# 1302LS1). They fit the best on OBS LS swaps in 2WD. Do NOT use the Speed Engineering headers, they say they work but they don't really on the 2WD, only the 4WD.GMT 400 brake master cylinder upgrade; GMT 400 big brake kit; GMT400 front brake upgrade; GMT 400 brake booster upgrade; GMT400 rear disc brake conversion. There are many ways you can go when you do a GMT400 rear disc brake conversion. I think a kit is the way to go. Below you will find GMT 400 rear disc brake conversion kits for 5-lug and 6 ...Ls swap headers . Any recommendations on long tubes for my 95 k1500 lq4 swap? Will gmt800 long tube fit? comments sorted by Best Top New Controversial Q&A Add a Comment Jester1614 • Additional comment actions. Truck will ...

The oil pressure gauge and coolant temp will reuse the existing sensors/wiring you will just need adapters for the 6.0 threads/ports. Speedometer should be one wire output from the 6.0 ecm that connects to one wire from the DRAC box behind the glove box (may have to adjust output from the 6.0 ecm).

so ive swaped a 2002 4.8 out of a p/u into a 98 p/u. i used all the 2002 pcm, harness & uhfb. started the truck today & all went well except the temp & fuel gauges dont work {kinda figured} i was going to put the 98 water sending unit in the pass side head and be simple but it doesnt come close to fitting in that little hole in the ls head so i ...Africa's largest economy wants more transparency in its oil dealings. The Nigerian National Petroleum Corporation (NNPC) has canceled a controversial oil bartering program which us...LS swap 5.3/4l80e/bw4401 4x4. NO START ISSUE!!! built the harness via instructions from lt1swap.com, pcm is hptuners with vats, egr, secondary o2's programmed out. 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 voltage and ...1993 C1500 LS Swap. Thread starter 70CamaroRS; Start date Oct 30, 2016; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission. Oct 30, 2016 #1 70CamaroRS Newbie. Joined Oct 2, 2016 Messages 6LS engine swap : r/GMT400. r/GMT400 • 3 yr. ago. by karmagettin11. LS engine swap. Would any of you consider swapping your engine with something like a 5.7 LS 6? I have …I'm planning on swapping a LQ4 into my 96 in place of a 5.7. 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.West Bend dyno told us that the starting price is around $4,500 for a complete long block. Typically, the price will go up from there based on your needs. While the LS engines are relatively affordable, you’re not going to be able to build a reliable 1,000 horsepower engine for a few thousand dollars.PRICING: $ 610.00 - Direct Fit harness for 1996-2000 (OBS) Trucks (PCM Stock Under Hood Location) $ 625.00 - Direct Fit harness for 1995 (OBS) Trucks (PCM Stock 96-00 Under Hood Location) Harness options: $ 15.00 - Fan Ready Connector (See Fan Harnesses Page for fan kits) $ 65.00 - Fan Kit for Duel Aftermarket Fans or Single 2-Speed Fan (2 Relay)Eastern North Carolina. Cardinal rule of LS swaps. GET EVERYTHING! Get the harness, PCM, tach module, pedal if DBW that came with your motor. Get it all! I’m in the process of working through my first swap. Even with limited auto electrical experience, the concept should be doable. I ended up with a freshened up 5.3 with a cam/spring kit.I watched this video and he seemed to get the wrong NV3500 at first (. xc_hide_links_from_guests_guests_error_hide_media. ) Keep in mind mine is a 4x4 not a 2wd. ralmo94 said: From the ECU part of it, you will need a manual calibration. A lot of different parameters in the IAC settings and others are different.

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This one has been in my 97 for almost two years. It's about 7/8" thicker than the factory radiator. Shroud fits perfect. Even at altitude (where the air is a lot thinner) it never gets above 195* w/ the AC on and a full load of …The other option is the E-rod which someone posted. The cheapest I have seen an LS3 e-rod is $9,100. The LT1 and LT4 are obviously much more. I know of someone who owned a shop that was doing the "gray area" smog checks that everyone seems to think is the way to go.2. Location. Ft. Lauderdale, Florida. I finally got my swap done. I had a harness modded for my truck. everything single thing is working, except the Tach gauge. from what i understand, the OBS tach cluster reads a 8 cylinder signal, and the 5.3 pcm reads a 4 cylinder signal. When i had my harness modified, and my pcm tuned, the …LT1Swap.com was already mentioned, but as spoke of, has a ton of info for wiring your "LS" type engine. Your can do it with four fuses and tie into your harness. Yes, locate and re-use your temp and oil sensors for the dash as the donor engine has two locations for temp sensors. Leave the Temp sensor for you engine in place, but go to …Accra, the vibrant capital city of Ghana, is a bustling hub of activity. Whether you are planning a business trip or a vacation to this West African gem, understanding the local ti...Gogoro, the company behind Taiwan’s thriving two-wheeler battery swapping ecosystem, is poised to succeed where others have tried and could not — and now it has the cash to do so. ...The easiest would be to get a bellhousing with an external Slave cylinder from an early nv4500. The NV4500 is also a hair longer than the nv3500 and you will either need to cut and paste your existing driveshafts or get driveshafts from a similar year/model from a gmt400. Oct 23, 2017. #3.LS swap is an infinitely better idea. Apr 30, 2010 #4 B. badassformula383lt1 OBS Enthusiast. Joined Apr 30, 2010 Messages 68 Reaction score 5. ... GMT 1600. Joined Mar 18, 2010 Messages 1,301 Reaction score 140 Location New york.Oct 30, 2022 ... An overview of my 1990 Chevy K1500 that now has a 5.3L LM7 and a 4L80E. I talk about how I made it work and there is a parts list at the end ...Ultimate GMT400 LS Swap Guide. I. Development and Design of the GMT400 A. Background and Origins. In the early 1980s, the truck market was rapidly … ….

Apr 17, 2020 ... Quick walkthrough of the steps taken to LS swap my '95 chevy 1500. This truck was a 4.3 v6 with nv3500 5-speed. We replaced the 4.3 with a ...The oil pressure gauge and coolant temp will reuse the existing sensors/wiring you will just need adapters for the 6.0 threads/ports. Speedometer should be one wire output from the 6.0 ecm that connects to one wire from the DRAC box behind the glove box (may have to adjust output from the 6.0 ecm).Been doing some looking at replacing the tired 305 in my truck, and before I just throw a 350 in it, I have a few questions about an LS swap. I have the necessary mechanical skills, as I am a tech for John Deere. Anyways, I can only seem to find info on mating an LS to an automatic. So my...I know people run the f body oil pan when they ls swap the r e 88-98 for the ground clearance. But has anyone used a h3 hummer oil pan or know of anyone that has used it? Oct 29, 2013 #2 capricefrk013 Toy Hauler. Joined Dec 3, 2009 Messages 507 Reaction score 25 Location NE Ohio.Sep 17, 2022 · 8. Reaction score. 4. Location. Georgia. I have a 1998 vortec 5.7 with a 4l60e i’ve been looking into a ls swap but i don’t even know where to start don’t have much mechanical experience or know what to get can someone tell me everything that’s needed i want to do it myself to learn location and names of things thanks. Sep 17, 2022. #2. GMT-400 5.3 push button 4wd swap. Been working on a 5.3 swap for the old Yukon. Truck has a lot of memories for me and my wife, and is lovingly named Jackson. Yes, a male. 1993 Yukon with 330k hard long miles. I bought a 2005 GMC Sierra for $1400 that came with a PSI harness and a set of dirty dingo engine mounts.Older OBS to LS wire harness setup. I have. A 1994 c1500 w/t that had the old 4.3 in it. I have the 5.3 dropped I with my 4L60 behind it. The guy from LT1 swap.com already did the pcm reprogrammig. Now for the harness !! I have trimmed it down like he stated in the lt1swap.com website.Feb 9, 2012 · Remove all the emissions pins from the LS1 harness. 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. If you are using a 4l80 then use the transmission pigtail harness you have (assumedly a 6.0/4l80 takeout). Apr 5, 2021 · 25. Reaction score. 14. Location. 32735. I'm swapping a new motor into my 98 k1500 as the stock 5.7 Vortec started knocking right after I was done putting a new tranny in and I'm at a crossroads. I have access to two motors. One is an aluminum block 5.3 and the other is a 5.7 ls1. Gmt 400 ls swap, 3. Reaction score. 0. Location. League City, Tx. Here's my current project that I'm working on. It's a 96 2 door Tahoe. It has a 08 Express Van 6.0 and 4L80e GEN 4, drive by wire, stand alone engine harness TSP 231/239 LS3 cam. huge learning experience., 6.0 ls swapped 95c1500. Thread starter nhyrum; Start date Oct 14, 2023; ... The LS engines use the same style of Saginaw pump that the GMT400's came with, factory lines should work just fine (I didn't do hydroboost, so can't confirm that part)., Dec 16, 2023 · JEGS 50538 - LS Engine Swap Motor-Mount Adapters Billet Aluminum [Adapts Chevy Motor-Mounts to LS-Series Engine] (5) $32.93. Schoenfeld 1514-LS1 - 1514-LS1 Chevy Truck Pulling Headers For GM LS Engines. (1) $302.99. , In recent years, the popularity of secondhand fashion has been on the rise. More and more people are turning to thrift stores, online marketplaces, and clothing swaps to find uniqu..., LS Gen3 24x Standalone Harness. Base Price: $ 495.00. Swap Specialties 24x Standalone wiring harness for GM Gen3 4.8, 5.3, 5.7, and 6.0L Engines have proven to be the best harness on the market today. We hand build every harness to fit exactly what your project needs and they actually form fit on the engine to make your wiring look and …, Remove all the emissions pins from the LS1 harness. 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. If you are using a 4l80 then use the transmission pigtail harness you have (assumedly a 6.0/4l80 takeout)., There's a local one, an L29, complete with harness and ECU for like 700 bucks. It would drop onto your mounts and fit just fine, it would be a pretty easy swap. The only real hangup is the 1500, your 10 bolt and 700R4 would die sooner than later. Dropping in a 4l80 at the same time and a SF 14B would be pretty easy as well, not much you can …, 1 flexplate spacer-GM p/n 12563532. Use these parts.6 of these longer flexplate bolts GM p/n 12563533. And a flat flexplate 12621399. If you want to install a GEN 1, GEN 1E or GEN 2 engine (TBI 305/350, Vortec 305/350, LT1 350 iron/alum heads and 4.3 L99 V8) on a newer LS style 4l60e, 4l65e,4l70e, use 1 of this kit., 1 flexplate spacer-GM p/n 12563532. Use these parts.6 of these longer flexplate bolts GM p/n 12563533. And a flat flexplate 12621399. If you want to install a GEN 1, GEN 1E or GEN 2 engine (TBI 305/350, Vortec 305/350, LT1 350 iron/alum heads and 4.3 L99 V8) on a newer LS style 4l60e, 4l65e,4l70e, use 1 of this kit., Apr 12, 2022 · So in my infinite wisdom, I am looking for driveshafts/yokes for my TH400 swap that is behind my LS swap. And while comparing prop shafts between my stock 1995 C1500 4L60E RCLB driveshaft(15004101), and the one for an 88 C2500 TH400 RCLB(12475006), I noticed the yokes are identical part numbers 12542963. , LS Barbie was a collection of photos by Ukrainian Angels Studio, also known as LS-Studio, a child-pornography ring, according to the Computer Crime Research Center., GMT 400 Common Problems: A Comprehensive Guide May 1, 2023. GMT400 Accessories – The Ultimate Guide April 30, 2023. The Chevy 4.3 Firepower Ignition Kit ... Ultimate GMT400 LS Swap Guide April 21, 2023. Recent Posts. Best Porsche Panamera Trim Level Under $25,000 . 2024 Bentley Flying Spur Configurations: A Luxurious …, Don't forget you have a swapped motor in a 4x4, which are harder to find headers for. But a lot of people will stick with the factory LS manifolds as they actually flow pretty well, unless you are getting into cam swaps etc. But if staying fairly stock, it's probably not worth the hassle to do headers. The motors got a cam and ported heads., This community is dedicated to information about LS engine swaps. Post your swap, questions, rants, helpful tips, etc. Members Online. Ls Swapping 03 F150 upvotes ..., I'm planning on swapping a LQ4 into my 96 in place of a 5.7. 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., 387. Reaction score. 133. Location. San Diego California. TCI makes a stand alone that'll go into the old diesels and carb gassers.expect about $7500.i believe it's the same case as the 4L80E at least their version is. I wanted it for my old 91 K2500 6.2L diesel but that was worth 5 times the truck lol. Dec 1, 2017., Reaction score. 29. Location. AB, Canada. There's a really great LS Swap GMT400 Facebook group called "LS Swapped 88-98 OBS Trucks/SUV". It's well worth checking out and tons of great information. For 400 RWHP, your best bet is always displacement or forced air. I would start with a 6.0 (LQ4 or LQ9)., TECH ARTICLE. LS Swap into 88-98 GM Truck. We have always wanted to build a 88-98 sport truck, and with the popularity of these trucks coming back, now was the perfect time. At the moment, these trucks are relatively cheap to pick up, and can be found with full power, AC, tilt, etc., Nov 18, 2020 ... We show some part #'s and my a/c setup on my ls swapped obs chevy in hopes to help you folks out that are looking for the same info I was ..., 25. Reaction score. 14. Location. 32735. I'm swapping a new motor into my 98 k1500 as the stock 5.7 Vortec started knocking right after I was done putting a new tranny in and I'm at a crossroads. I have access to two motors. One is an aluminum block 5.3 and the other is a 5.7 ls1., Naples, fl. New member first post. I am looking at a new engine. LS swap is a very simple swap for me to do. My concerns is fuel economy. Most guys don't care but my commute is roughly 100 miles a day. What numbers are you getting at the pumps? I'd really like to run a 4.8 w the 4l60 for the cheapest scenario., Axiom Space is making rocket deals with NASA and Roscosmos Dear readers, Welcome to Quartz’s newsletter on the economic possibilities of the extraterrestrial sphere. Please forward..., Sep 30, 2021 ... Part 11: Today, the 1991 Chevy OBS project truck gets a new fuel pump capable of supplying fuel to the 5.3 that will be going in soon., Actuator is TechCrunch's weekly newsletter covering all things robotic. Welp. Three straight weeks of work travel amid a seemingly endless pandemic finally caught up with me. Forgi..., 6 Liter LS Truck Engine Swap. Today, it's engine swap time with an 6 liter LS engine from a salvage GMC 2500. This engine will go into our 1971 C-10 Cheyenne and we'll show you how to extract and prepare the entire drivetrain for a truck heart transplant. Season 14, Episode 18. Change Season., Ls swapped using the 411 pcm in my 98 silverado. Tuning with hp tuners, does anyone know the correct setting to get my fuel gauge to work? Jan 4, 2022 #2 C. codemain19 Newbie. Joined Nov 6, 2019 Messages 1 Reaction score 0 Location 17813. Following working on mine as well right now. Jan 5, 2022, Designed for the popular LS Engine Swap applications, ProCharger’s LS Engine Swap Serpentine and Cog Drive Supercharger Kits provide a solid, stable mounting and drive configuration for a wide range of ProCharger supercharger models. Building on more than 10 years of LS forced induction leadership, ProCharger is the first to offer a complete ..., Reaction score. 335. Location. Michigan. To swap in the nv4500 you need the transfer case that was hooked to it. The one in your truck has a different input spline size. Going 6L look for a k2500 in the yards that was hooked to a 6.0 for the nv4500. For an LQ9 I think you are looking for Escalade or Denali donars., I think transplanting into a regular GMT400 (non-3500HD) you'd have a hard time shoehorning an Allison in there unless you did trans tunnel surgery or had a body lift. It is correct though that these 2 years of HD's did offer the 8.1, it was either that or you got the 6.5TD. Only 2 engine options those years, no more 7.4., Older OBS to LS wire harness setup. I have. A 1994 c1500 w/t that had the old 4.3 in it. I have the 5.3 dropped I with my 4L60 behind it. The guy from LT1 swap.com already did the pcm reprogrammig. Now for the harness !! I have trimmed it down like he stated in the lt1swap.com website., Mar 12, 2019 ... LS Swap Do's & Don'ts on a Chevy K1500 ... Brake Master Cylinder Upgrade GMT 400 '88-'98 Trucks ... GMT400 Dana 70 axle conversion is DONE and ..., Fitting a classic car or hot rod with a newer LS or LT V8 engine poses many challenges, including a gauge cluster in most cases. While there are many different routes builders can take to solve ..., Older OBS to LS wire harness setup. I have. A 1994 c1500 w/t that had the old 4.3 in it. I have the 5.3 dropped I with my 4L60 behind it. The guy from LT1 swap.com already did the pcm reprogrammig. Now for the harness !! I have trimmed it down like he stated in the lt1swap.com website.