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  1. Mogman

    4L80E Transmission controller upgrade. What’s this?

    Yea, not sure why the NA chip got so expensive, same damn part with a little different programming. I can reprogram the chips from the original TCM, the Eastern chips are read only, no way to erase them to reprogram, I have the NA and Turbo files. The chips are easy enough to get but they are...
  2. Mogman

    4L80E Transmission controller upgrade. What’s this?

    For the price difference I would use the $17.00 one and fudge the TPS setting to fine tune the shift points. https://www.easternsurplus.net/Products/SearchResults
  3. Mogman

    4L80E Transmission controller upgrade. What’s this?

    The eproms are cheap and easy to get, you should be able to get the entire TCM with eprom for about 250 or so much cheaper than the alternative not to mention the work involved.
  4. Mogman

    4L80E Transmission controller upgrade. What’s this?

    It is an EMI filter, clearly on the schematics, yes I would leave it in place
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