Thread: 6l90e or 4l80e?
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Old 03-15-2015, 10:27 PM   #5
clinebarger
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Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
Re: 6l90e or 4l80e?

Quote:
Originally Posted by 67chevysupercharged View Post
First off thank you to you both for the help. Kind of bums me out that the 6L seems to be a bunch of headaches, it would have been nice to have the double overdrive. What all would be required to bolt the 4l80e to the gen 4 6.0? And I apologize if the original post rambled a bit too much, it was a little late last night ��.

Thanks,
Zak
You will need a T42 TCM. I'm guessing you have a E38 ECM? Both will need a compatible OS flash into them.

You will need the flexplate, Spacer & bolts off the genIII engine.

It will be easier to sell the 6L90E with the matching ECM. The T43 TCM & E38 ECM are (for lack of a better term) Married to each other.

Then start over with a different E38 ECM & T42 TCM, Then either modify the harness to work with a T42 TCM or buy a harness.


T42 TCM.....Gen IV controller for 4L60E & 4L80E transmissions.

T43 TCM.....Gen IV controller for 6L80E/6L90E transmissions (Mounted inside the trans).
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