LWN (2.8L) Custom Standalone Harness/Solution


DmaxSwap.com has worked to develop the cleanest solution for wiring your LWN 2.8L Duramax drivetrain for simple operation with nothing more than power, ground, ignition and cranking signals. This purchase will include conversion of your donor engine to chassis harness, a new ECM, ECM tuning and test starting the system. Additionally you can select the option to purchase a donor harness.

* We do not offer this harness without purchase of ECM and tuning as every setup is tested before it gets sent to you and requires our proprietary solutions.

** At this time we can only use 2016-2018 LWN donor harnesses.



Lead time on harness conversion is generally 3-4 weeks from the time it is received and checked in. At the time of check-in, the harness will be inspected and subject to additional charges (either mandatory or suggested) if there are any issues with wires, corrosion, pins or connectors.

The DSP-4 tune is built with 4 power levels. The power levels are customized based on the information provided in our Tune Request Form. Below we’ve provided a rough idea of the output and purpose for each tune. Power gain will be ~50hp without supporting upgrades, with ~15hp increments on each of the tune settings.

The tune settings are as follows:

  1. heavy tow tune
  2. light tow
  3. optimized stock (improved fuel mapping)
  4. street/race performance (depending on supporting mods)

All DSP-4 Tuning include the 4 position DSP switch and anodized aluminum knob with label ($50 value)

LWN Tuning Policy

Additional information

Weight 10 lbs
Dimensions 20 × 15 × 6 in
Harness Conversion

You will ship your donor, We supply donor

ECM Tune

DSP-4, Single Tune


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