Hi, I own a 03 gmc with a 5.3 and I want to swap in a o4 gto ls1.Can anybody tell me if all of my factory truck wiring will plug right in.If not does anybody make a simple harness to do the swap.Also what about the computer.If anybody has done this or can help it would be greatly appreciated.
Just swap your truck intake and oil pan pick-up ect and everything will bolt right up. Then get some tuning to take advantage of your new found horsepower! Nelson tuning in case you didn't know. Your truck harness will not plug into your LS1 without doing some swapping.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
Just talk to Nelson!! He will know everything you need to know! And have every harness you need
DANIEL CAMMED SS 13.46 @ 98.17-- 8.58 @ 80.31
2003 Silverado SS / LQ9 6.0L / Wheatley 93 Octane Tune / 224/228 .581 .588 110lsa / Patriot Gold Dual Springs / Comp Hardened Push Rods / Circle D 3800 stall / Pacesetter LT's / 4:10 Gears / Transgo HD-2 Shift Kit / K & N Cold Air Intake / Corvette Servo / Aeroforce Interceptor / Autometer Narrorband(Wideband on the way) / Mobile 1 Synthetic / Single Chamber Flows with X Pipe / Cats Delete with Cutouts
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