![]() is a great source for everything needed to modify your own harness. Just have to have patience and keep very organized. This was our first attempt as modifying a harness, which went smoother than I thought. Now that we got the engine all prepped for install, it was time to work on the harness. This barbed fitting is a AC Delco part, 12559760. Some LS engine will have this blocked off, like ours did. To adapt to the factory vacuum booster on the truck, we needed to get a vacuum port fitting to go into the back of the manifold. No need for new hoses or anything, which kept costs down and made the process that much easier. Using the Dirty Dingo adapter on the back of the Sanden 508, allowed us to use the factory AC lines with little “massaging” to get them to line up. We could have used the R4 compressor that originally came with the truck, but decided to replace it with a new Sanden 508. We turned to Dirty Dingo for the AC bracket, which mounts it up on the passenger side, same area as the factory compressor. All other accessories were used from the 2005 Yukon. Knowing we will have AC in the truck and re-use most all that is there, we needed a bracket for the compressor. The water pump, knock harness in the valley cover, intake gaskets & thermostat are all replaced. We stripped the complete harness off the engine. Plus, it is easier to work on them out of the truck and do these things now, rather than later. The first tasks were to clean up the engine, and do some preventative maintenance to it, knowing it has over 100K miles. The engine is a 5.3 / 4L60E combo that was pulled from a 2005 Yukon. At the end of this article, we will breakdown the cost we incurred, which covers most items, and maybe just missing a few misc. ![]() By using as many parts from the donor Yukon, we were able to keep cost down and give it a more factory look. Our intention was to see how inexpensive we can do the swap, and kept record of most costs. Knowing we had pranks to LS swap the truck, we did not worry too much about the engine in the truck, and was looking more for a straight & clean body. We were able to buy the truck for $3,300, in which the owner claimed a “383”, but we knew that probably wasn't true. For the base of our project, we started with a 1990 C1500 truck that we purchased locally. At the moment, these trucks are relatively cheap to pick up, and can be found with full power, AC, tilt, etc. We have always wanted to build a 88-98 sport truck, and with the popularity of these trucks coming back, now was the perfect time. ![]()
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January 2023
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