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4L80/85E Transmissions. 6L90 Transmission Discuss the 4L80/85E transmissions found in the 6.2/6.5L equipped vehicles and Duramax equipped vans. 6L90 discussion.


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Old 09-09-2019, 09:12 PM   #1 (permalink)
Dabbs_diesel
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1995 to 1997 4l80e problems

I just put a 1997 4l80e into my 1995 k1500 6.5 4x4 and I'm running into a problem with the wiring. I have a extra plug with a female end on it that doesn't plug into anything on the transmission harness and a eXtra 2 prong plug on the same wiring harness for my transfer case that doesn't plug into anything. I also noticed that the 97 doesn't have a sensor on the back of the transmission and my 1995 did.

What do I have to do to get by this problem ? Need the truck running asap for work.

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1995 k1500 6.5L

Last edited by OkDually; 09-09-2019 at 09:14 PM. Reason: prefix/sig
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Old 09-10-2019, 03:03 PM   #2 (permalink)
Dabbs_diesel
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I just found out that it's the speed sensors I'm having issues with. I'm going to try a few things like swaping the sensors input to output. I had them both out so maybe I installed them in the wrong holes.

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Old 09-10-2019, 03:16 PM   #3 (permalink)
johnH123
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There shouldn't be a rear speed sensor on the actual tranny in a 4x4 operation. The rear sensor should be in the transfer case. IIRC there is a rubber/plastic plug that fills the rear hole in the tranny.
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1993 K3500- 4x4, single cab/long bed, single rear wheels, 4.10 rear end, F vin, GM3 turbo, Nv4500 manual with Luk clutch and single mass conversion, factory red interior.

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Gone but not forgotten: 2001 silverado 2500hd CC/SB, 4x4, 6.0 vortec, 229k miles when I traded it.
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Old 09-10-2019, 03:26 PM   #4 (permalink)
davester
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I don't know about your model truck, but for the newer ones (GMT800's like my '04 Sierra with the 4l80e), GM just uses the front speed sensor in the transmssion, and either the rear speed sensor in the transmission for 2wd trucks or the speed sensor in the transfer case for 4wd trucks (and just have a plug in the rear speed sensor port of the transmission). The transfer case wiring harness includes a short extension to connect the transmission case rear speed sensor connector to the speed sensor in the transfer case.
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Old 09-10-2019, 10:50 PM   #5 (permalink)
Dabbs_diesel
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I connected that short extension connector to the extra female connector on the transmission and everything plug in and all wiring clips match up perfectly. Need to put exhaust back on tomorrow and do a bit of welding seeing I cut out the soot trap and muffler and then put fluids in transmission and take it for a drive and see how it goes.

Fingers crossed lol

Fist time doing a transmission swap.
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