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12-15-2010, 10:03 PM
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#1 | |
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AF Enthusiast
Join Date: Aug 2004
Location: Sharon, Pennsylvania
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4L80E Harness Adapter
I am working on my father in laws 1991 Chevy suburban 3/4 ton 4x4 6.2L Diesel w/ 4L80E transmission.
He replaced the filter/fluid and lost reverse, couldn't figure out why so he asked me to replace the transmission, he got a used transmission from a local yard (the only one that had one), it came out of a 93 pickup w/ 5.7L, well the main harness plug is different. The old tranny has a 12-pin connector w/ center bolt. the new one is a 11-pin and just clips on. Anyone know why they are different or where I can buy an adapter for it. I know they make adapters to go from the 4L60e to a 4L80e. I do know the new transmission is a remanufactured transmission (has a sticker on it) so that could be why it has a different harness. any suggestions????? Joe
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R.I.P. - 94 Jeep Grand Cherokee Limited 5.2L V8 Quadra-Trac, 3" Budget Boost, K&N FIPK Gen II (Cold Air Intake), FlowMaster American Thunder (Exhaust). W.T.T.F. - 1998 Jeep Grand Cherokee 5.9 Limited - Deep Slate Pearl - K&N FIPK GEN II (COLD AIR INTAKE), Altezza Tails and Crystal Clear Front end light with HID Kit and NP242 Swap. 
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12-16-2010, 07:05 AM
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#2 | ||
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AF - Advisor
 
Join Date: Sep 2005
Location: New London, Missouri
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Re: 4L80E Harness Adapter
Quote:
I would use the wiring from old transmission. If you still have the transmission that came out of it remove the wiring inside wiring harness and plug-in from it. And Also check the solenoids and sensors from old transmission if the new transmission solenoids are different.
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Remember proper testing gives us the answer to many problems. MT |
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12-16-2010, 07:56 PM
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#3 | |
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AF Regular
Join Date: Oct 2005
Location: Cullman, Alabama
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Re: 4L80E Harness Adapter
I don't think the 93 with 5.7 came with a 4L80E trans? Both trucks 3/4 ton? I may be wrong but... I think there were some changes around the 91 / 92 year model.
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----------------- Elbert Clarke |
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12-17-2010, 06:10 PM
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#4 | |
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AF Newbie
Join Date: Dec 2010
Location: Edmonton
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Re: 4L80E Harness Adapter
GM changed the harness in 1993 from a 12 pin to a 11 pin as they were experiencing a transmission leak. You can either replace the 93 harness with the old 12 pin harness or what is recommended ... buy a 4L80E transmission repair end for 1994-2002 vehicles ....runs about $50 from electronic advantage. See eBay. You have to cut the connector wiring harness and splice in the 11 pin connector... only cut one wire at a time....you will have one wire left over you just tape off. Make sure there are instructions included....you need the pin out.
Bill  |
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01-06-2011, 04:34 PM
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#5 | |
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AF Newbie
Join Date: Jan 2011
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Re: 4L80E Harness Adapter
Difference is as someone commented early (12 pin) vs later (11 pin) 12V+ power was on 2 pins early-pins C & K later style put 12V+ on one pin only-pin E
A diagrahm of the plugs with each pins ID letter and a chart of of the funtion of each pin (by letter) may be viewed at www.pirate4x4.com search the forum thread YJ wrangler 6.0L 4l60e rewiring harness This may be bulletin board#post8030893 It address converting for a 4l80 from a 4l60 but contains the info on early & later plugs. |
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