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07-08 4L60e to 6L80e swap

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Old 04-22-2016, 08:00 PM
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It may have an extra sensor i am not certain on that.

I would go to the car lot or find a buddy with a 6L80e (4wd) and compare to yours.
If it only has the tcm plug (passenger side) then you are good to go.
Old 04-22-2016, 08:20 PM
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The plugs for 2 and 4wd transmission is the same it will just have the transfer case connectors on it, i am fairly certain the speedo reads off the transmission oss....

Niff awesome write up man, have you done anything more with the tu/td? I am seriosuly thinking about swapping a 6l80 into my yukon....
Old 04-22-2016, 09:17 PM
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Nah sure haven't been pretty lazy considering i don't drive it very often.
It's spent so much time sitting the battery crapped. Replaced it, then when i decided to drive it, boom dead battery.


I just have my tow/haul set up to control it to downshift for roll racing
Old 04-22-2016, 09:45 PM
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I have access to gm tis2web so i may be able to reflash the bcm, hoping it will work, just need to find a 4wd 6l80 that somebody doesnt want a small fortune for, even if i need to rebuild it!!!
Old 04-23-2016, 07:20 AM
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Hell yeah
Keep us updated on the bcm stuff.
Old 04-23-2016, 08:16 AM
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Will do, im going bit different as a have a harness off of a used engine i installed last week that had a couple of the wire bundles cut so i am going to pull the trans connector and probably vvt and repin my harness, if my harness isnt already set up for vvt, have seen a few non vvt trucks that have already had the wires for the vvt in place just seem to need the actuator harness on the timing cover....
Old 12-07-2016, 03:10 PM
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Hey niff anyway I could get your phone number? I'm in the process of the swap and need some help
Old 12-08-2016, 06:44 AM
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Originally Posted by Wolftrk99
I have access to gm tis2web so i may be able to reflash the bcm, hoping it will work, just need to find a 4wd 6l80 that somebody doesnt want a small fortune for, even if i need to rebuild it!!!

I have an awd 6l80 from a 10k mile 2010 Denali. Comes complete with the transfer case, front driveshaft, and cooler lines. No converter. Let me know if you're still hunting for one and if this suits your needs
Old 12-08-2016, 07:32 AM
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Originally Posted by Mang213
I have an awd 6l80 from a 10k mile 2010 Denali. Comes complete with the transfer case, front driveshaft, and cooler lines. No converter. Let me know if you're still hunting for one and if this suits your needs
I have already built one, and then had another one dropped in my lap, thanks anyway!! Not sure the 2010 tcm would work in my 08, different os calibrations...and different part numbers on valve body and tcm.
Old 12-08-2016, 10:50 AM
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Originally Posted by Wolftrk99
I have already built one, and then had another one dropped in my lap, thanks anyway!! Not sure the 2010 tcm would work in my 08, different os calibrations...and different part numbers on valve body and tcm.
2010+ 6L80e doesn't play nice with the 07-08 os
Basically the tcm would need to be swapped out to the 07-08.

Mine is a late 09-early 10 before the tcm and OS got swapped


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