I would love to hear any updates you have as well.
I just put this same transmission in my truck over the Christmas break. Haven't been able to fully complete the drive learn procedures yet, as I keep switching tunes and starting over again.
My stock trans, I had upgraded the valve body to a Revmax billet one, which held my gearing together, but didn't do anything for my input shaft.
The input shaft gave out during normal driving and little throttle, but I believe the initial break was due to the violent 3-4 shift that is being talked about on here. It was actually extremely violent a couple of times during a weekend when I was pulling my travel trailer, even trying to baby that particular shift.
I've played with tuning quite a bit using the company I paid for a couple of years ago. If I run a tune that locks the tcc in 3rd, then the 3-4 shift seems harsher than all of the other shifts. If I run a tune that doesn't lockup until 4th, the 3-4 shift seems to be about equal to the other shifts. Since I feel like the 3-4 shift broke my stock trans, I've likely been over-analyzing that particular shift.
I switched to a new tuner yesterday which has better support, and is known by Revmax. The initial tune I was given locks up in 3rd, and I noticed the hard shifting while driving last night. They sent me another tune today that doesn't lock until 4th, and I plan on installing it tonight and driving around.
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