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01-21-2018, 09:23 AM
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#1 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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4l80E questions
I have an '03 GMC van with 6.0l and 4l80E for swap purposes. The van was a Dept. of Corrections van and they had been using it for parts. It has no gage panel so I can't tell what gear the tranny is indicating. That matters because the tranny is in limp mode (only 2nd and R) and I am trying to figure out why before I pull it. There is tranny fluid in the round connector and some sources say that could be the problem and others say not. The plug does have power to it with the key on. What should I be looking for? Replace the harness? If so where is the best source for replacement.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal.  We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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01-21-2018, 09:25 AM
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#2 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: 4l80E questions
You need to read the trouble codes. It sounds like an electrical problem and trans fluid in the connector is a problem.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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01-21-2018, 09:50 AM
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#3 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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Re: 4l80E questions
Only code it shows is a temp. sensor voltage, don't remember the number off the top of my head.
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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01-23-2018, 03:32 AM
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#4 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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Re: 4l80E questions
Anyone else?
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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01-23-2018, 03:42 AM
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#5 |
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Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 4l80E questions
Limp mode is 2nd and 3rd, but if you say it doesnt have power going to it when the key is on, then you need to figure that out since that's probably the problem. Check all the fuses.
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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01-23-2018, 07:54 AM
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#6 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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Re: 4l80E questions
The plug does have power with the key on.
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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01-23-2018, 01:10 PM
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#7 | |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: 4l80E questions
Quote:
I'll have to check back through some of Clinebargers posts, he's the resident trans expert and has previously posted his preferred sources for trans harnesses.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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01-23-2018, 08:28 PM
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#8 | |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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Re: 4l80E questions
Quote:
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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