Skip to product information
SKU:
NLT1I00074
Ships for free in 2–4 business days.
1997-2006 GM LS DBC Standalone Harness for T56 Manual 4.8-6.0L
$199.99
In Stock
$199.99
Sale price
$199.99
Regular price
This new aftermarket standalone harness fits compatible 1997-2006 GM Gen III LS drive-by-cable engines with a T56 manual or other supported non-electronic transmission.
Estimated delivery between
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- GM LS1 / LS6 5.7L drive-by-cable engines with compatible EV1-style injectors
- GM 4.8L, 5.3L, and 6.0L Gen III Vortec engines converted to matching DBC controls
- T56 manual or supported non-electronic transmission swaps
Product Overview
A manual-transmission LS project does not need unused automatic-transmission branches hanging in the engine bay. This harness focuses the swap on engine control and the T56-related connections, helping builders start with a cleaner layout than a heavily modified donor harness.
Harness selection is controlled by the PCM, throttle type, injector connectors, MAF, alternator, crank/cam sensors, and transmission functions. Confirm whether reverse lockout, speed signal, and backup-light wiring are included. PCM tuning and VATS changes are separate.
Key Features & Performance
- Standalone engine harness for manual-transmission swaps
- Drive-by-cable Gen III LS configuration
- T56 / non-electronic transmission compatibility where matched
- Labeled connectors and fuse/relay provisions as shown
Common Uses
- Wiring an LS engine and T56 into a classic vehicle
- Replacing a spliced or unreliable swap harness
- Building a cleaner standalone engine-control system
Technical Specifications
- Product Type: Standalone LS swap harness
- Throttle: Drive by cable
- Transmission: T56 manual / supported non-electronic
- Engine Family: GM Gen III LS
- Condition: New aftermarket harness
Installation & Fitment
- Match PCM plugs and service number
- Confirm injector, MAF, alternator, and sensor connectors
- Plan speedometer, reverse lockout, tach, fan, and fuel-pump outputs
- Have the PCM calibrated for the finished drivetrain
- Ground the engine, chassis, battery, and PCM circuits correctly
Compatibility Notice
Northline Parts does its best to list all known compatible models. The correct part may fit an application that is not shown above. Model year, production date, serial number, engine or equipment specification, installed options, and previous repairs can change fitment. Match the original part, reference number, dimensions, connectors, mounting points, and product photos before purchase.
Frequently Asked Questions
Q: Will it run a drive-by-wire throttle? A: No. This harness is for a drive-by-cable setup.
Q: Does it remove VATS? A: No. Security and engine calibration changes must be completed in the PCM.
Q: Can I use an automatic transmission? A: Use a harness built for the exact electronic automatic. This one is aimed at T56 or compatible non-electronic transmissions.
Q: Is this an original-equipment part? A: No. This is a new aftermarket product. Brand names and part numbers are used only to identify compatible applications.
Part Summary
keywords: T56 LS swap harness, 1997-2006 DBC standalone wiring, manual transmission LS1 harness, 5.3 T56 engine swap wiring, Gen III LS non electronic transmission harness
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, specifications, and application before purchase.