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Wiring 4l80e to LS1 w/T56

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Old 04-26-2011, 06:27 AM
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Default Wiring 4l80e to LS1 w/T56

Did some reading and I noticed alot of you guys use the wiring harness from an a4 then use an adapter harness to make it work with the 4l80e. I also found a company(begins with Spear) that has a wiring harness that can be used from t56 to the 4l80e without switching to the 4l60e harness first.

Has anyone ran the premade conversion harness on their car? If so, how was the install etc. Going the A4 seems the easiest as I dont have to repin the PCM harness(or do i?) but being in Alaska Im limited on parts.

Thanks!
Old 04-26-2011, 12:24 PM
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Originally Posted by XtremeDime
Did some reading and I noticed alot of you guys use the wiring harness from an a4 then use an adapter harness to make it work with the 4l80e. I also found a company(begins with Spear) that has a wiring harness that can be used from t56 to the 4l80e without switching to the 4l60e harness first.

Has anyone ran the premade conversion harness on their car? If so, how was the install etc. Going the A4 seems the easiest as I dont have to repin the PCM harness(or do i?) but being in Alaska Im limited on parts.

Thanks!
You will have to move a couple of wires even with the A4 harness (since its meant for a 4L60E). Its not difficult, I did it with a harness from lsxtune.com
Old 04-27-2011, 10:53 AM
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what about the reverse lights how do you go about that??
Old 05-12-2011, 01:02 PM
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From what I've researched, you just connect wires that went to T56 reverse switch to the PNP switch of the A4 shifter



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