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Thanks a lot!If you can, also pull a sample of the diff fluid for lab testing. It's jut more information on wear, possible contamination, or incorrect lubricants. I had engine oil, trans & rear diff fluids all tested. The engine & diff fluids were both found to have no unusual signs of wear or excessive metals, but the trans..... well it was time for a rebuild.
Not to hijack OPs thread but are you saying that the COBB TCM tune gets rid of the harsh shifts on tuned trucks? I have the harsh 3-4 or 3-5 shifts and harsh 1-2 shifts with the COBB OTS tune I am running. Clearing the TCM learn often fixes it for a month or so and then it comes back. Do I just need to buy the TCM tune?Your tranny is likely fine, I’d flush and refill. Many aftermarket tunes get all clancky over time. I had a Gearhead tune that would run buttery smooth for a month and then do harsh 3-4 or 3-5 shifts and harsh 1-2 also. Every time I had to remove the tune, go back to stock and do again. Till I went Goosetune. It’s worth it on the TCM tune alone
I would reach out to @GooseTuned. Usually a mechanical fault will likely be a consistent failure. Something that changes with electronic programming is pointed more towards a programming issue that can be overridden.Not to hijack OPs thread but are you saying that the COBB TCM tune gets rid of the harsh shifts on tuned trucks? I have the harsh 3-4 or 3-5 shifts and harsh 1-2 shifts with the COBB OTS tune I am running. Clearing the TCM learn often fixes it for a month or so and then it comes back. Do I just need to buy the TCM tune?