Originally Posted by LS1GMCTruck
Is this book year model dependent?
Is this book year model dependent?
Tired ol' 5.7, 5.3 swap in progressHandle every stressful situation like a dog.If you can't eat it or hump it.Piss on it and walk away.
I'm refering to a thread here on this board.
The GM Service Manuels are different for every/each model year. Your truck is a 1996, correct? Look on E-Bay for a 1996 Chevrolet/GMC C/K Service Manuel, Volume 2.
Honestly, after dealing with my brothers situation, I think if it were to be done over, he/we woulda just done the wiring ourselves. Lost less to it than you would think.
So you ask, if its so easy why are you participating in the "why wont it start thread"? Honestly, I jumped in mid stream and trying to figure out who did what didnt come easily.
If you do opt for the popular vendor aftermarket harness and plan to run LS1 fans, request a longer harness.
Haynes/chilton manuals have wiring diagrams in the back.
LSX conversions, so easy a caveman can do it.
LOL, thanks! Once you get some wiring diagrams, things will come together. I wouldn't attempt anything without them. You can pretty much use your factory fuse box under the hood but you'll need to add relays for the electric fans somewhere.You lost me....
BTW your engine bay is my desktop and motivation for this project!
97 GMC, 2002 LS6.
1991 GMC Syclone #1428
wrong one
1996 GMC extended cab, 2003 5.3/auto
I am trying to pull the 350 tomorrow and I have everything pulled but the wiring. How do you disconnect the wires on the passanger side firewall? Do you just cut them, also how do you approach the tangle of wires on the drivers side under the fuse box? I can't see any connectors on them...
Tired ol' 5.7, 5.3 swap in progressHandle every stressful situation like a dog.If you can't eat it or hump it.Piss on it and walk away.
Don't cut or remove any wires until you have the reworked or new harness in your hands. Remove all connections from the stock engine and save all the sensor that are hooked to the connectors, reconnect them to the harness after removing them from the engine so you'll know exactly what hooked to where. When you get the new harness grafted into the old, then cut wires that aren't being used. Leave the stock PCM in place to save numerous possible headaches.
if you're getting a custom harness made be sure to tell them how long you need the PCM leads or at least tell them where you plan to mount the PCM and they can tell you how to measure the amount of lead you'll need.
Last edited by RedHeartbeat; 08-08-2008 at 11:33 PM.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
if your talking about the wires beside the a/c unit on firewall there should be a 7mm ? bolt on each side you need to take out. There are a few wires that goes into the dash from that plug.
1996 GMC extended cab, 2003 5.3/auto
I thought I didn't need the stock PCM in the swap
So to remove the old engine from the truck do I pull the harness off the truck and just fold it out of the way or do I undo the harness from the truck and pull it with the motor? If there is someone who is willing to talk to me via phone that would help me out a lot cause I am completely lost with how this works...
Last edited by aarolar; 08-09-2008 at 08:27 AM.
Tired ol' 5.7, 5.3 swap in progressHandle every stressful situation like a dog.If you can't eat it or hump it.Piss on it and walk away.
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