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Melted Trans. Wiring Harness, 4L80E


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hey guys! i'm new to the forum but, i'm looking for information to helps fix my truck... it's a 2000 GMC Sierra 2500 ext. cab LWB with the 6.0 liter power plant and 4L80E transmission.
it was my grandpa's truck that my dad bought from him recently and it'd be a ******** shame to burn it up or sale it for scrap/parts... it's been a great truck since my grandpa bought it 12-13 years ago, never had a problem except the fuel pump went out a couple years ago and the fuel pressure regulator was bad when we purchased the truck, it was dumping fuel straight into the vacuum system and getting HORRIBLE fuel econ.
ANYWAY, last week, my pop's was driving it and was scraping in a oil lease and when he went to leave the truck got stuck... like, buried to the axle; leaf-spring pack, driveshaft, trans x-member, etc sitting on the ground.
well, the exhaust heat caused the tall grass under the truck to catch fire, and needless to say, caused a LOT of damage... frown.png it melted the trans portion of the wiring harness, the park/neutral switch, the shift cable end, and god knows what else.
i'm looking for a replacement transmission harness or info that'll lead me in the right direction, it's my dad's daily driver and he's been driving it in its, "limp-home mode" and I don't know how much longer it can take operating un-managed.
I thought i'd found a harness in a salvage yard and went to go pick it up, when I got there I was talking with the guy whom I had talked to the previous day about the part and he informed me that the engine/trans electrical harness he had was for a chevy 1500 5.3L 4L60E, instead of the 4L80E like is in mine and that it would NOT work for what I needed.
help.gifhelp.gif
was he correct?.. is there any way that I could modify the harness from a 4L60E to work for my 4L80E? would the park/neutral safety switch and the shifter cable interchange between the 2 transmissions? confused.png
I had enough trouble finding the one I thought was correct... it seems like the 6.0L/4L80E combo is a somewhat uncommon powertrain option around the SW Oklahoma area, cause I cant find another one...
any info, hints, tips, tricks, etc would be a great help in my endeavor... all help will be GREATLY appreciated!
thanks in advance for any help I can get! bow.gif

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I have no suggestions on a fix for you but I do have a question. When your duel pressure regulator went out, what kind of fuel milage were you seeing. My truck went from about 11 mpg to 9 very suddenly recently and I couldn't figure out why.

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hey guys! i'm new to the forum but, i'm looking for information to helps fix my truck... it's a 2000 GMC Sierra 2500 ext. cab LWB with the 6.0 liter power plant and 4L80E transmission.

it was my grandpa's truck that my dad bought from him recently and it'd be a ******** shame to burn it up or sale it for scrap/parts... it's been a great truck since my grandpa bought it 12-13 years ago, never had a problem except the fuel pump went out a couple years ago and the fuel pressure regulator was bad when we purchased the truck, it was dumping fuel straight into the vacuum system and getting HORRIBLE fuel econ.

ANYWAY, last week, my pop's was driving it and was scraping in a oil lease and when he went to leave the truck got stuck... like, buried to the axle; leaf-spring pack, driveshaft, trans x-member, etc sitting on the ground.

well, the exhaust heat caused the tall grass under the truck to catch fire, and needless to say, caused a LOT of damage... frown.png it melted the trans portion of the wiring harness, the park/neutral switch, the shift cable end, and god knows what else.

i'm looking for a replacement transmission harness or info that'll lead me in the right direction, it's my dad's daily driver and he's been driving it in its, "limp-home mode" and I don't know how much longer it can take operating un-managed.

I thought i'd found a harness in a salvage yard and went to go pick it up, when I got there I was talking with the guy whom I had talked to the previous day about the part and he informed me that the engine/trans electrical harness he had was for a chevy 1500 5.3L 4L60E, instead of the 4L80E like is in mine and that it would NOT work for what I needed.help.gifhelp.gif

was he correct?.. is there any way that I could modify the harness from a 4L60E to work for my 4L80E? would the park/neutral safety switch and the shifter cable interchange between the 2 transmissions? confused.png

I had enough trouble finding the one I thought was correct... it seems like the 6.0L/4L80E combo is a somewhat uncommon powertrain option around the SW Oklahoma area, cause I cant find another one...

any info, hints, tips, tricks, etc would be a great help in my endeavor... all help will be GREATLY appreciated!

thanks in advance for any help I can get! bow.gif

That Powertrain is the only gas combo for 2500 ,

 

I'm afraid the only smart way to fix this and it's to go new ,

 

Go to a dealer and look at his pics at the parts counter and point to what ya need , very easy ...

 

If they can't get it then you're in for a search

 

Don't forget how old the truck is

 

Good luck

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