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05-13-2009, 07:08 PM | #1 |
Registered User
Join Date: May 2009
Location: pasadena tx.
Posts: 9
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modifying 4.8 vortec wire harness need help.......
Dropping the motor in my 67 already, got told I need to modify thee wire harness but clueless on wat to do anyone have a diagram or can tell me exactly wat to do...
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05-13-2009, 08:37 PM | #2 |
J'ville Junkman
Join Date: Mar 2006
Location: Pomeroy, Ohio
Posts: 572
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Re: modifying 4.8 vortec wire harness need help.......
Go check out LS1tech website, I understand you can get everything you need there. There is also a good writeup in the FAQ that mentions the wiring stuff. It might be called a 5.3 swap on the cheap or something.
Goodluck.
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72 3/4t Suburban 402BB (Daily driver for 8 years) 68 GTO (never ending proj) 91 Kawasaki ZX-7R 57 Chevy 210 Wagon - 9 Passenger (Wife's project-working on floorpans) 73 Corvette (17 yr old daughter's: Another project - what's wrong with me?) 53 Willys M38 |
05-13-2009, 09:08 PM | #3 |
Registered User
Join Date: Nov 2007
Location: Vernon, Texas
Posts: 331
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Re: modifying 4.8 vortec wire harness need help.......
I went to lt1swap.com and got the pinouts for my harness, ive printed them out and went down each pin to see if i needed it or not
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05-14-2009, 12:59 PM | #4 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: modifying 4.8 vortec wire harness need help.......
wait 4 me performance will hack up your harness and tune with free unlimited retunes for $360. i sent mine off yesterday. they eliminate the vats, not just some added box like most.
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, Last edited by brad_man_72; 05-14-2009 at 12:59 PM. |
05-14-2009, 02:05 PM | #5 |
Registered User
Join Date: May 2009
Location: pasadena tx.
Posts: 9
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Re: modifying 4.8 vortec wire harness need help.......
cool thanks hopefully i get it done pretty quick i want the truck running already... what do yall plan on doing about the gauges, can we use the new a/c system?
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05-14-2009, 09:22 PM | #6 |
Registered User
Join Date: Nov 2007
Location: dallas Tx in front of you
Posts: 182
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Re: modifying 4.8 vortec wire harness need help.......
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05-14-2009, 09:49 PM | #7 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: modifying 4.8 vortec wire harness need help.......
gauges, you have to have the comp reprogrammed to sent out a v-8 tach signal, you can drill and tap plate above oil filter to make oil gauge work, rt head near the rear their is a plug you can remove redrill and tap for temp sending unit.
if using a transmission that doesnt have a speedo cable you need an eletronic speedometer (definatly cheapest and easiest fix, but not the only way to do this) im putting an eletronic speedo behind my factory gauge face and needle. im thinking a 94ish s-10 speedo will "work"
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
05-14-2009, 10:16 PM | #8 |
Registered User
Join Date: Nov 2007
Location: Vernon, Texas
Posts: 331
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Re: modifying 4.8 vortec wire harness need help.......
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05-14-2009, 11:17 PM | #9 |
Senior Member
Join Date: Aug 2005
Location: tulsa OK
Posts: 3,070
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Re: modifying 4.8 vortec wire harness need help.......
also most aftermarket tachs have a switch/s to make the tach read 4/6/8 cyl. you can simply put the tach into 4cyl. mode and it'll read accurate, w/out changeing the tach output of the PCM.
Last edited by 68 short step; 05-14-2009 at 11:18 PM. |
05-15-2009, 01:48 PM | #10 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: modifying 4.8 vortec wire harness need help.......
ill be sure to take lots of pics, and if i get it to work ill post up a how to. i think i heard about somebody else on the board doing something simmilar.
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
05-16-2009, 12:15 AM | #11 |
Registered User
Join Date: Aug 2006
Location: Reno, NV
Posts: 346
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Re: modifying 4.8 vortec wire harness need help.......
Another option for the oil pressure gauge is to just use the stock hole behind the manifold. The PCM doesn't need the stock sending unit signal. Adapter bungs are also available for the temp sensor if you don't want to drill and tap.
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1971 Suburban 4x4, LQ4 6.0L, 4L80E, etc. |
07-27-2010, 08:32 PM | #12 |
Addicted to Rust
Join Date: Dec 2009
Location: Abbeville SC
Posts: 1,030
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Re: modifying 4.8 vortec wire harness need help.......
You have to make an adapter though the LS oil sender seals with a gasket and straight metric thread the "truck" sender will be pipe.
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Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public. |
07-27-2010, 09:40 PM | #13 |
Next project: 1970 K10
Join Date: Feb 2004
Location: Fort Collins, Colo 80524
Posts: 6,684
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Re: modifying 4.8 vortec wire harness need help.......
Although it's an older thread, I'm gonna move it to the LS swap area.
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Bob 1970 Chevy K10 LWB "Goldie" 350/TH350 next project!! 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE |
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