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For 2003-2007 LS3 Standalone Wiring Harness T56 Or Non Electr LS 4.8 5.3 6.0 DBW
$164.75
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For 2003-2007 LS3 Standalone Wiring Harness T56 Or Non Electr LS 4.8 5.3 6.0 DBW is backordered and will ship as soon as it is back in stock.
Bull Boost Performance | SKU:
793945587759
Questions on fit or freight? Ask our parts team · Mon–Fri 9–5 ET
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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...…
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.
Shipping, returns & warranty
Wrong item or delivery damage? Contact our team for help with your order.
Inspect your part before signing for it and note any damage on the delivery receipt.
Fitment: Vehicle fitment is listed in the title and description. Check the model years, trim and installation notes before ordering.
Check vehicle compatibility
Check the product fitment notes for your year, model and trim
Need help choosing?
Not sure? Email support@k2-industries.com for a real specialist to help you order
Installation questions?
Installation questions? Email our team before or after your purchase
Warranty details
Questions about warranty coverage? Our team can walk you through it. Contact us
Return policy
See the return policy for this item’s details. Questions? We’re happy to help before you order.
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?
Check the product description and fitment notes for your year, model, trim and body style. If anything is unclear, email support@k2-industries.com with your vehicle details and this product link before ordering.
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?
Return policy
See the return policy for this item’s details. Questions? We’re happy to help before you order.
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.
See Why Customers Love K2 Industries
Customer Reviews
Overall rating: 4.6 / 5 from 974 reviews.
Product came quick and fit great. I love it.
Fits great works great
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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 help
Delivery issue support
Real Experts Answer the Phone
Post-Purchase Installation Support
Curated Quality
Return policy
K2 Industries
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K2 Industries
Other Brands
Pre-order fitment help
Delivery issue support
Real Experts Answer the Phone
Post-Purchase Installation Support
Curated Quality
Return policy
Add to Cart
Check compatibility before ordering
Check compatibility before orderingThe K2 Difference
- • Check the product fitment notes and contact our team if you need help confirming compatibility before ordering.
- • 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.
Find your next upgrade
Frequently 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?
Return policy
See the return policy for this item’s details. Questions? We’re happy to help before you order.
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?
Warranty details
Questions about warranty coverage? Our team can walk you through it. Contact us
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.
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
