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T56 Stand alone Wire Harness Drive by Wire LS LS3 Vortec 03-07 4.8 5.3 6.0 DBW
Product Description
| Features | Direct Fit, Easy Installation |
|---|---|
| Manufacturer Warranty | 1 Year |
| Custom Bundle | No |
| Other Part Number | T56 |
| Fitment Type | Direct Replacement |
| Modified Item | No |
| Non-Domestic Product | No |
| Fitment | 03-07 LS3 Vortec |
| Manufacturer Part Number | 03-07 LS Vortec Standalone Wire Harness Drive By Wire T56 4.8 |
| Type | Standalone Wire Harness |
Key Features:
1. All of our harnesses are built with OEM Quality and better
2. All Harnesses have a High Quality Grommet installed on the Harness (THAT SLIDES FOR DESIRED MOUNTING)
3. Harnesses receive a quality check before shipment.
4. GM Color Codes. Many Companies Do NOT Use GM Color Codes.
5. High Quality Reinforced Ring Terminals
6. 1200 Degree Fiberglass Braid on All Circuits Ran by Heat
7. All Factory CPA (Connector Position Assurance Locks)
8. 18" ADDED LENGTH FOR EASY COMPUTER MOUNTING
9. All harnesses come with the needed Dash Connections, which include Speedometer, Tachometer, Park Neutral, TCC, Malfunction Indicator, and a DLC Port.
Compatible Models and Years:
- Fits 2003 - 2007 CHEVROLET, GMC, CADILLAC AND HUMMER TRUCK ENGINES (DRIVE BY WIRE ONLY) WITH T56 TRANSMISSIONS.
Specifications:
These harnesses are designed for retrofitting '03 - '07 Vortec engines (4.8, 5.3, 6.0-Liter) and T56 transmissions into older muscle cars and street rods or newer non-emissions controlled vehicles.
Harness allows use of the factory Vortec intake manifold.
They are completely plug and play with four wire hookup (switched power, constant power and ground connections required).
Harnesses are designed with a sliding grommet seal and 4 - 5 feet of length from the rear of the cylinder head to the PCM mounting position under the vehicle dashboard.
A sliding grommet seal allows for professional, leak proof installation.
Harnesses are professionally constructed from Brand New GM Delphi Connectors and TXL (Polyethylene Cross Linked) High Temperature Wire to GM Specifications.
All harnesses are 100% Quality Inspected prior to shipping.
Parcel Content:
- Complete Engine and Transmission Harness
Note:
The harnesses are for non-emissions equipped vehicles and do not include air pump or EGR provisions.
…
Product Description
| Features | Direct Fit, Easy Installation |
|---|---|
| Manufacturer Warranty | 1 Year |
| Custom Bundle | No |
| Other Part Number | T56 |
| Fitment Type | Direct Replacement |
| Modified Item | No |
| Non-Domestic Product | No |
| Fitment | 03-07 LS3 Vortec |
| Manufacturer Part Number | 03-07 LS Vortec Standalone Wire Harness Drive By Wire T56 4.8 |
| Type | Standalone Wire Harness |
Key Features:
1. All of our harnesses are built with OEM Quality and better
2. All Harnesses have a High Quality Grommet installed on the Harness (THAT SLIDES FOR DESIRED MOUNTING)
3. Harnesses receive a quality check before shipment.
4. GM Color Codes. Many Companies Do NOT Use GM Color Codes.
5. High Quality Reinforced Ring Terminals
6. 1200 Degree Fiberglass Braid on All Circuits Ran by Heat
7. All Factory CPA (Connector Position Assurance Locks)
8. 18" ADDED LENGTH FOR EASY COMPUTER MOUNTING
9. All harnesses come with the needed Dash Connections, which include Speedometer, Tachometer, Park Neutral, TCC, Malfunction Indicator, and a DLC Port.
Compatible Models and Years:
- Fits 2003 - 2007 CHEVROLET, GMC, CADILLAC AND HUMMER TRUCK ENGINES (DRIVE BY WIRE ONLY) WITH T56 TRANSMISSIONS.
Specifications:
These harnesses are designed for retrofitting '03 - '07 Vortec engines (4.8, 5.3, 6.0-Liter) and T56 transmissions into older muscle cars and street rods or newer non-emissions controlled vehicles.
Harness allows use of the factory Vortec intake manifold.
They are completely plug and play with four wire hookup (switched power, constant power and ground connections required).
Harnesses are designed with a sliding grommet seal and 4 - 5 feet of length from the rear of the cylinder head to the PCM mounting position under the vehicle dashboard.
A sliding grommet seal allows for professional, leak proof installation.
Harnesses are professionally constructed from Brand New GM Delphi Connectors and TXL (Polyethylene Cross Linked) High Temperature Wire to GM Specifications.
All harnesses are 100% Quality Inspected prior to shipping.
Parcel Content:
- Complete Engine and Transmission Harness
Note:
The harnesses are for non-emissions equipped vehicles and do not include air pump or EGR provisions.
$164.75
Unit price
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Unavailable
- Fitment verified for YOUR exact year/model/trim
- Not sure? Email support@k2-industries.com for a real specialist to help you order
- Got install questions? Text a tech who's actually installed this part before, even after it arrives
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T56 Stand alone Wire Harness Drive by Wire LS LS3 Vortec 03-07 4.8 5.3 6.0 DBW is backordered and will ship as soon as it is back in stock.
Bull Boost Performance | SKU:
sku-43401801236700
Couldn't load pickup availability
Wrong fit or arrives damaged? Free replacement available
30,000+ Happy Customers
30-Day Returns
1 Year Warranty
Details
Details
Product Description
| Features | Direct Fit, Easy Installation |
|---|---|
| Manufacturer Warranty | 1 Year |
| Custom Bundle | No |
| Other Part Number | T56 |
| Fitment Type | Direct Replacement |
| Modified Item | No |
| Non-Domestic Product | No |
| Fitment | 03-07 LS3 Vortec |
| Manufacturer Part Number | 03-07 LS Vortec Standalone Wire Harness Drive By Wire T56 4.8 |
| Type | Standalone Wire Harness |
Key Features:
1. All of our harnesses are built with OEM Quality and better
2. All Harnesses have a High Quality Grommet installed on the Harness (THAT SLIDES FOR DESIRED MOUNTING)
3. Harnesses receive a quality check before shipment.
4. GM Color Codes. Many Companies Do NOT Use GM Color Codes.
5. High Quality Reinforced Ring Terminals
6. 1200 Degree Fiberglass Braid on All Circuits Ran by Heat
7. All Factory CPA (Connector Position Assurance Locks)
8. 18" ADDED LENGTH FOR EASY COMPUTER MOUNTING
9. All harnesses come with the needed Dash Connections, which include Speedometer, Tachometer, Park Neutral, TCC, Malfunction Indicator, and a DLC Port.
Compatible Models and Years:
- Fits 2003 - 2007 CHEVROLET, GMC, CADILLAC AND HUMMER TRUCK ENGINES (DRIVE BY WIRE ONLY) WITH T56 TRANSMISSIONS.
Specifications:
These harnesses are designed for retrofitting '03 - '07 Vortec engines (4.8, 5.3, 6.0-Liter) and T56 transmissions into older muscle cars and street rods or newer non-emissions controlled vehicles.
Harness allows use of the factory Vortec intake manifold.
They are completely plug and play with four wire hookup (switched power, constant power and ground connections required).
Harnesses are designed with a sliding grommet seal and 4 - 5 feet of length from the rear of the cylinder head to the PCM mounting position under the vehicle dashboard.
A sliding grommet seal allows for professional, leak proof installation.
Harnesses are professionally constructed from Brand New GM Delphi Connectors and TXL (Polyethylene Cross Linked) High Temperature Wire to GM Specifications.
All harnesses are 100% Quality Inspected prior to shipping.
Parcel Content:
- Complete Engine and Transmission Harness
Note:
The harnesses are for non-emissions equipped vehicles and do not include air pump or EGR provisions.
Our Guarantee
Our Guarantee
Warranty Assurance:
At K2 Industries, your satisfaction is our priority, and we stand behind the quality of our products. Here's a brief overview of our warranty:
Defect Coverage:
If you find a defect after receiving your order, get in touch with us. We're committed to resolving the issue, whether it involves a replacement, repair, or refund.
Installation Note:
Please inspect your purchase before installation. Unfortunately, damages post-installation are not covered, so ensure everything looks good beforehand.
Claims Made Simple:
Need to make a claim? Reach out to us at support@k2-industries.com. We're here to assist you. Just keep your original packaging and documentation handy.
Your Satisfaction Matters:
Your trust in K2 Industries is appreciated. We're dedicated to ensuring your satisfaction with our quality automotive parts.
Shipping & Returns
Shipping & Returns
Shipping Information:
At K2 Industries, we strive to provide a seamless and efficient shopping experience for automotive enthusiasts like you. Our commitment is to deliver high-quality parts to your doorstep with the utmost care.
Fast and Reliable Shipping:
Many of our products are stocked in our local warehouse, ensuring swift processing and delivery. Orders placed for these items typically ship within 2-5 business days, allowing you to get your parts in no time.
Extended Selection, Global Reach:
To offer you a broader range of automotive parts, some items are sourced from trusted suppliers around the world. While these products might have a slightly longer processing time, we assure you that the wait is worth it for the exceptional quality and value they bring.
Shipping Transparency:
For products shipped internationally, we provide estimated delivery times on the product page. Rest assured, we are continually working to optimize our supply chain and minimize any potential delays.
Combined Shipments:
To streamline your shopping experience, if your order includes items from both our local warehouse and international suppliers, they may be shipped separately. You will receive separate tracking information for each shipment.
Questions or Concerns?
If you have any questions about shipping or would like assistance tracking your order, our dedicated customer support team is here to help. Feel free to reach out to us at support@k2-industries.com.
You can also track your order here
Thank you for choosing K2 Industries for your automotive needs. We appreciate your trust in us.
FAQs
How do I confirm this part fits my vehicle?
Use the vehicle selector at the top of this page to verify fitment. If anything's unclear, send us your year/model/trim (or VIN) via live chat or email support@k2-industries.com — we'll confirm fitment for free, before you commit.
How long until I get my order?
In-stock items typically process in 3-5 business days, then ship — most domestic orders arrive within 3-7 business days after that. Larger freight items take 3-10 days in transit. Some items are made-to-order (carbon fiber, aero kits) and require 10-25 business days of production before shipping — these are marked on the product page.
What if it arrives damaged?
Inspect your shipment when it arrives, take photos of any damage to the box and part, and reach out via live chat or support@k2-industries.com. For freight deliveries, note visible damage on the paperwork before signing. We handle the carrier claim and get you a replacement.
What if I want to return it?
You have 30 days from delivery. As long as the part is uninstalled and in original condition, you can choose between an exchange, store credit (no fees, never expires — our most popular option), or a refund. Drop us a message and we'll walk you through the easiest path.
Can I install this myself, or do I need a shop?
Depends on the part. Some are straightforward DIY, others are body shop or specialist work. Each product page indicates the recommended install path. If you're unsure, message us with your build details and we'll give you a real assessment.
What's the fastest way to reach you?
Live chat and email — typical response time is a few business hours, and you can reach out anytime. Chat with us on the site or email support@k2-industries.com. We resolve issues directly far faster than going through your bank or card processor.
The K2 Difference
- • Built by enthusiasts who've made every fitment mistake you're afraid of. Now we verify parts for 30,000+ builds a year with zero wrong-part claims.
- • Real specialists answer your questions in minutes, not chatbots reading scripts. We've built the same cars you're building.
- • Freight damage, wrong parts, installation question, we handle it so you don't deal with suppliers or shipping companies.
Built By Someone Who's Been There
Max, the Owner, started in his garage making E36 M3 tail lights in his own oven.
- • Started modifying cars before he could legally drive them
- • Spent years hunting down parts that actually fit and don't suck
- • Made the same fitment mistakes you're afraid of
What You Get With Every Order
Products Selected to Meet Quality & Fitment Standards we Stand Behind.
Get Help From People Who Actually Understand Builds & Fitment.
Designed to Resist UV Exposure, Wear, and Everyday Use.
Join Thousands of Builders Who
Trust K2
What Sets K2 Industries Apart?
We don’t just sell parts. We actually care.
Pre-Order Fitment Verification
Damage Replacement
Real Experts Answer the Phone
Post-Purchase Installation Support
Curated Quality
30-Day Returns
K2 Industries
Other Brands
K2 Industries
Other Brands
Pre-Order Fitment Verification
Damage Replacement
Real Experts Answer the Phone
Post-Purchase Installation Support
Curated Quality
30-Day Returns
Add to Cart
Perfect fit guaranteed
Perfect fit guaranteedFrequently Asked Questions
How do I know this will actually fit my car?
How do I know this will actually fit my car?
Every part listing shows compatible years, models, and trims. But here's the thing—trim packages and factory options can be confusing. If you're not 100% certain, text us at 772-277-2495 with your VIN or photos of your car. We'll verify fitment before you order so you're not stuck with an $800 part that doesn't fit. We've done this for 30,000+ builds. We've seen every weird trim combo and factory option. Takes us 2 minutes to verify, saves you weeks of headaches.
What if the part arrives damaged or is the wrong item?
What if the part arrives damaged or is the wrong item?
We handle it. You don't fight with freight companies or file claims. Text us photos within 48 hours of delivery. If it's damaged or wrong, we ship a replacement immediately. You're not waiting 6 weeks for a freight claim to process. We eat the cost, not you. This is why we package everything like it's going to war. But if something slips through, we fix it ASAP. No forms, no back-and-forth, no "file a claim and wait." Just text us and we handle it.
Can I install this myself or do I need a shop?
Can I install this myself or do I need a shop?
Depends on the part. Emblems, front lips, some spoilers, bolt-on, DIY-friendly, you can do it in your driveway with basic tools. Full bumpers, hoods, wide-body kits, possible for experienced DIYers but most people take them to a shop for paint and install. Check the product description for installation difficulty. If you're unsure, text us. We'll be honest about whether you can handle it or if you should take it to a pro. We'd rather you know upfront than get frustrated halfway through.
What's your return policy if it doesn't fit or I don't like it?
What's your return policy if it doesn't fit or I don't like it?
30 days, unused parts in original packaging. You pay return shipping unless we sent the wrong part or it arrived defective. Once you install it, modify it, paint it, or mount it, we can't take it back. That's why we push so hard on verifying fitment BEFORE you order. We don't want you stuck with something you can't use. Text us before ordering if you're unsure. We'll confirm fitment so you never have to worry about returns.
Do you offer financing?
Do you offer financing?
Yes. Affirm and Shop Pay available at checkout for orders over $50. Split payments over 3-12 months depending on order size. No hard credit check to see your options. Most people use this for big-ticket items like body kits, suspension setups, or wheel/tire packages. Rates vary based on credit. You see the monthly payment before you commit. Makes it easier to build now instead of waiting months to save up.
What if I have questions after I receive the part?
What if I have questions after I receive the part?
Text 772-277-2495. We don't disappear after you buy. Fitment questions, installation issues, "does this bolt go here" questions... we'll walk you through it. We've installed these parts ourselves or helped hundreds of people install them. You're not getting transferred to a call center in the Philippines. You're texting someone who's actually installed your part before. If we can't help remotely, we'll recommend a local shop that knows these parts.
Why should I buy from K2 instead of eBay/Amazon/other sites?
Why should I buy from K2 instead of eBay/Amazon/other sites?
eBay and Amazon sellers don't answer fitment questions. They don't verify your VIN before shipping. They don't handle freight damage claims for you. If something goes wrong, you're filing disputes and waiting weeks. We're builders selling to builders. We verify fitment before you order. We handle damage claims same-day. We answer texts in minutes. We're not the cheapest, but you're not gambling $800 on whether a part fits. You're paying for support, verification, and someone who cares if your build goes sideways.
What does your warranty cover?
What does your warranty cover?
1 year against manufacturing defects: cracking, warping, paint peeling, hardware failure, fitment issues caused by the part being made wrong. Does NOT cover installation damage (you cracked it bolting it on), road damage (curb rash, rock chips), or normal wear. If it breaks because we made it wrong, we replace it free. If it breaks because you hit a parking block, that's on you. We're fair about it. Send photos and we'll tell you honestly if it's covered.
Shipping
Do you ship overseas?
Do you ship overseas?
Yes, we ship all over the world. Shipping costs will apply, and will be added at checkout. We run discounts and promotions all year, so stay tuned for exclusive deals.
How much does shipping cost and when will I see the total?
How much does shipping cost and when will I see the total?
Depending on where you're located, small parts can ship free. Large parts like bumpers, hoods, and body kits require freight shipping. Uou'll see the exact cost at checkout before you pay. Freight usually runs $150-$300 depending on size and your location. We know it's expensive. We negotiate the best rates we can. If you're ordering multiple large parts, text us. We can sometimes combine shipping and save you money. We're not hiding fees in the final step. What you see at checkout is what you pay.
How long will it take to receive my order?
How long will it take to receive my order?
It depends on where you are. Orders processed here will take 5-7 business days to arrive. Overseas deliveries can take anywhere from 7-16 days. Delivery details will be provided in your confirmation email.
See Why Customers Love K2 Industries
Customer Reviews
Overall rating: 4.6 / 5 from 932 reviews.
Fits great works great
AVS 16-20 Honda Civic Coupe Ventvisor In-Channel Window Deflectors 2pc - Smoke
Roof rails a proper fit for my Ford Transit Connect - SWB. Some concern about the threaded connectors, wondering if rivnuts might offer stronger attachment.
A bit tricky to do by yourself but once you get it on it looks great
2013-2015 Honda Civic Sedan CS Style Front Bumper Lip Unpainted PU
GREAT EXPERIENCE SHIPPING WAS QUICK IM ENJOYING THE PRODUCT
Thanks, I needed this part, fits and looks great. Since I live in Montreal, you need this to hide your private stuff and avoid break ins. This is appreciated greatly. I love it.
2008-2015 Smart Fortwo OE Style Black Cargo Cover Vinly Aluminum Rod
Great
2007-2015 Infiniti Carbon Fiber Hood DarwinPRO (BKSS) Fits G25, G35, G37 Sedan
Very happy
Type-SA double sided carbon fiber 1-piece decklid with integrted spoiler for 2024 Ford Mustang
Easy instal looks great!!!
Looks awesome and has been holding on amazing for the past few weeks so fsr
Looks exactly how I planned! Bad ass grille
2008-2010 Subaru Impreza WRX Hatchback OE Style Grille Matte Black ABS
They fit and look great.
2017-2024 Honda Ridgeline OE Black Front Rear Floor Mat Carpet Nylon
Took 2 weeks to deliver with standard shipping. But well worth the wait. Install took 25 minutes with minimal tools and the lights look amazing. Fitment is perfect and the quality is excellent. Its kinda pricey but you get what you pay for with ntxglow products. Highly recommend!
Fitted and bolted up perfectly! Also made the car sound wayyyy better.
N52 N51 Header Exhaust for BMW E90 E92 E93 E82 128i 325i 328i 330i
Nice job guys
LED Dynamic Z-Logo Side Marker Lights — Sequential Turn Signals for Nissan 370Z (2009–2020)
Amazing drl
The tailgate table is very sturdy and solid. I had the USMC EGA lasered onto my Goose Table.
Jeep Wrangler 2018-Present JL / JLU - Goose Gear Tailgate Table
Wing came in perfect condition! No chip paint, no scratches. Amazing service!
The size was exact! The color match was perfect! Never been more happier
2002-2006 Acura RSX DC5 Rear Trunk Spoiler Ducktail Wing Lip ABS
Good
13-15 Honda Accord LED DRL Projector Headlights Black Housing
They look amazing, and after using ChatGPT to help me understand how to install them (because the instructions were not very helpful whatsoever), I’m glad with how they turned out. My problems are that the lights aren’t too bright, the instructions weren’t helpful, and the arrival date was wrong, even if they arrived early.
Spec-D Projector Headlights Ford F150 (04-08) Mark LT (06-08) Halo Black / Smoked / Chrome
Installation was super easy, you just have to line everything up right, i’d recommend using green frog tape! Really brings the rear end of the car together, looks amazing!
VW Arteon Carbon Fiber Rear Trunk Spoiler – Gloss Black (2019–2023)
Easy installation
Nice set up and sizing, but color is not a match. My loss.
Door Jamb Sticker Cover Up Kit (Printed Series) - 2021-2023 Bronco
Great lil wing looks good and came pretty quickly.
1992-1995 Honda Civic Hatchback Glossy Black Roof Window Spoiler ABS
This isn’t on K2, but the lenses came In which I was thrilled about. I’d already removed my OEM lenses from their housings. The passenger side lense fit well and mostly flush. The driver side, however, looks like it was slightly warped and caused poor fitment and what looks like a small dip in the red portion of the lense. I had no choice but to use them, as my OEM lenses were no longer usable. It can be very difficult to get replacement lenses in a timely manner for a Del Sol. I drive my car everyday, so I had to just go with it. Again, not a K2 issue but presumably the manufacturer.
Fit perfect
2018-2023 Kia Stinger 4PC Front Rear Car Floor Mats Carpet Nylon
This rear bumper fits great the only thing is the trunk button on the bottom is cut a little to wide but that’s an easy fix it looks great and definitely makes the rear look more aggressive. I love it!
looks and feels great!!
2004 subaru lip fit grate no complains about it came perfect ✔️
2004-2005 Subaru Impreza WRX DS Unpainted Black Front Bumper Lip PU
The box was a little crushed, but the line was packed well and it wasn't a problem. The instructions are 3 pages of color pictures and lots of explanations. Very nice. The line itself is a very nice bit of kit with a swivel AN line end that allows a No-tension install. No leaks so far and it looks great. It came with new banjo bolts and copper crush washers. The only criticism I have is that I would have liked this hose coated in black so it disappears like the original, but it does look good, so I don't mind.
Upgraded VANOS Oil Supply Line – M52 / M54 Engines (E36, E46, E39, E60, X3, X5, Z3, Z4)
Looks great, covers typical 3rd gen rust on the bed
2002-2008 Ram 1500 2003-2009 Ram 2500 3500 8FT Fender Flares
Very easy and straightforward ordering process, everything was very simple and it arrived quicker than I expected! Love the look of it.
Type-CJ double sided carbon fiber 3 inch cowl hood for 2015-2017 Ford Mustang
It was perfect and very easy to install
Very easy to install. The product feels very durable and looks amazing
Looks good some modifications but it works
Great quality came in a few weeks after purchasing will shop with you guys again
Lights look awesome, they are for my daughter’s BRZ and she loves them! You will need to swap two wires in the harness for the DRLs to change color. The picture shows you the sequence by color.
Scion FR-S Subaru BRZ Toyota GT86 RGB Headlights (2012-2021)
These side window windows deflectors are durable and do their job perfectly
Not a fan of how thick the sides are on these vent pieces. I feel as if they would have been fine if they kept the oem size on the sides and just made them.
