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Old 05-26-2007, 08:24 AM
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59 chevy truck with new 5.3 engine

I'm needing some advice on wiring for my 59 Suburban. I'm about to start the process of clipping the front and installing a 5.3 with corresponding 4L60 automatic. I need to replace all the wiring as it's old and stiff. Where should I purchase a harness and who best to alter and reprogram the 5.3 harness?
I've dug around a bit but can't find anything like my situation. The 5.3 harness is included with the drivetrain.

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Old 05-26-2007, 09:13 AM
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Doc here,

Ron Francis puts out a first class kit..about $600.

If you have the stock computer, you shouldn't need reprogramming..you can purchase performance chips that will add up to 100 HP over the counter..

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Old 05-26-2007, 09:25 AM
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Stock computer. Don't I need to have it reprogrammed to have alarm removed?
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Old 05-26-2007, 10:57 AM
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Doc here,

What is the computer out of?

Alarms should be part of the BCM, not the engine control computer.

Doc
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Old 05-26-2007, 12:09 PM
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Not sure what vehicle yet. Guess it's a pickup (2000-2006)
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Old 05-26-2007, 12:12 PM
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So all I need is the ECM? What about the transmission?
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Old 05-26-2007, 12:44 PM
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Doc here,

YOu MUST FIRST select the EXACT engine AND Vehicle it will be removed from BEFORE any grafting plans may be made..

On just the range of years you stated, there exists OVER 150 schematics for those years, not to include body styles..

The best advise At this point I can give you, is when you select the donor Vehicle, get the ECM, PCM and BCM, and every stitch of wire in the car..(so long as it won't be extra$$) Write down the Make Model, year, and VIN of the Donor..for future reference might need it. You May not use half the stuff..but it's better than needing it and not having it.

If the donor harness is pristine AND not CUT..you may not have to buy a kit..that will save you at LEAST $600 and as much as $2000 when all is said and done.

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Old 05-26-2007, 12:47 PM
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Thanks Doc. I hope to find out today.
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Old 05-27-2007, 11:04 AM
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garretthes That sure is a nice suburban How about posting some pictures of that jewel in the thread "55 to 59 chevy truck owners" in the hot rodders lounge.I am sure we would all like to see them and here about your suburban.
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Old 05-27-2007, 07:33 PM
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That's very kind of you! I will try to do that soon. Hopefully I will be updating my Project Journal very soon. I'm ready to get started again.
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Old 05-29-2007, 11:15 PM
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He thinks it's from an Avalanch. Still waiting for more details.
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Old 06-27-2007, 08:41 PM
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Update

We mocked up the engine today. It looks great! There are still some questions as to where the engine will site front to back. I have to get a radiator tomorow and check the distance.
It's from a 2004 LS 4 door truck. I'm pulling it back out in the morning, welding in the mounts and painting the frame.
I have the engine harness and computer. What's next? Send it off for re-programing?
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Old 06-28-2007, 05:07 PM
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Quote:
Originally Posted by garretthes
We mocked up the engine today. It looks great! There are still some questions as to where the engine will site front to back. I have to get a radiator tomorow and check the distance.
It's from a 2004 LS 4 door truck. I'm pulling it back out in the morning, welding in the mounts and painting the frame.
I have the engine harness and computer. What's next? Send it off for re-programing?
Doc here,

If the Computer, Harness and Engine lived together in the Donor Car..Install them as a unit AND get it running BEFORE any attempt at a re~Program..It will save you headaches.

DO ALL your welding FIRST, then install the computer..or you run the risk of destroying it with spurious high current spikes.

Doc
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Old 07-02-2007, 05:56 AM
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Thanks Doc. So you're saying we can get it running w/o a reprogram?
Still to do:
Have drive shaft modified
Plumb new fuel lines including return
Install master cylinder and plumb new brake lines
Paint firewall and front frame
And of course....wiring
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Old 07-02-2007, 05:18 PM
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Doc here,

If the Harness, Computer and Engine all lived together in the Donor Vehicle, YES..

Programming will not change anything as far as getting it to run first..

Your programming should occur AFTER the vehicle is set up in drivability mode, then changes made for performance Vs Economy, weight, gear ratio, and a few other parameters to include depending on what your going for..

Get it Running FIRST..so you know all systems are at least operating at "stock" performance levels..and you can eliminate that from any problems AFTER programming.

Kinda like saying"Be sure the Amp works Before Plugging in the Guitar and trying to play Rock and roll"

Doc
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