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  1. M

    4L80E Transmission controller upgrade. What’s this?

    I agree with you 100% amount not cutting up the oem Harness which is what prompted my original post. When I purchased the US shift TCU W/ harness I thought I was going to be able to simply remove the harness between the TCU and transmission and replace with the Black dog harness. Turns out that...
  2. M

    4L80E Transmission controller upgrade. What’s this?

    At the time, I could not find a new TCM for less than $450. Used oem was more. Both minus the eprom. only way to search at parts store was by using civilian H1 and i wasn’t certain it would work for my application because of our 24v system. Should have researched that some more. Also heard...
  3. M

    4L80E Transmission controller upgrade. What’s this?

    Short answer is I do not have one. It was missing when my truck delivered. I searched for replacements but was unable to find one for a reasonable price and all seemed to be missing the eprom.
  4. M

    4L80E Transmission controller upgrade. What’s this?

    Ah, Yes it is clearly on YOUR schematics. It is not on mine. I was pretty sure it was a filter just wanted to know if it was supposed to be there or if it was something someone added on for some unknown reason. Thanks for the info. If you don't mind, can you share the drawing or TM number you...
  5. M

    4L80E Transmission controller upgrade. What’s this?

    Hello guys, I have purchased a us shift Quick 2 Transmission controller along with the wiring harness to connect everything from Black Dog Customs. I am installing on a M1097A2. In the process of connecting the harness I realized that I would have to remove a bunch of crap to remove the oem...
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