Duramax Diesel Conversions

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Hello everyone
I'm currently building a truck it's a 1998 Chevrolet K3500 crew cab dually, it has the 6.5/4l80e combo which is ready to pull. I'm going with a 03 LB7 and allison trans. I currently have the harness getting reworked by Ken Wolkens for a stand alone and have the ECM and TCM already reflashed. Now the questions I have is what is all needed to integrate the LB7 to work with the GMT400 platform? I was told the starter relay will not work along with the gauges, what is all reguired to get the HVAC system working with the 98 hvac and the lb7? and what other problems will I have to figure out? thanks

Many questions....

First, there's no need to have the Duramax underhood/in-cab harnesses reworked. With the exception of splicing in the HVAC controller/package wiring into the Duramax in-cab harness, the rest of the original in-cab/underhood electrical will be stripped out and replaced with the Duramax harnesses, fuse panels and electrical centers. This actually makes it all a lot easier. Trying to jury-rig an old/new composite electrical system adds so much complication to the conversion that it discourages most who attempt it.

The ideal is to create an electrical system that looks and functions like the factory Duramax system. The truck will be worth more at the end and it'll be easier to troubleshoot if a problem does appear.

Here's a story about a 1998 Chevy LBZ conversion that used our motor mounts and Conversion Guide

This Thread has answers for some of your questions.

Our Duramax Conversion Guide has answers for most questions.