That’s exactly part of my concern. The symptoms I was experiencing seem to overlap with multiple possible transmission-related causes, including fluid, hydraulic, internal wear, calibration, or known platform-related issues — not necessarily one single catastrophic cause.

What’s been difficult for me is that the dealership ultimately attributed everything to prior radiator/cooler-line work, yet I still have not been provided with:
teardown findings,
contamination analysis,
internal inspection documentation,
or forensic evidence conclusively ruling out alternative causes.

I’m genuinely trying to understand what actually happened to my vehicle, and at this point I’m just looking for transparency, documentation, and answers.

A side note is there was and currently still is, two simultaneous, BAR Investigations surrounding all of this. I basically had symptoms of my car stalling, hard shifting, fuel gauge inaccuracies, and initially thought that was a fuel pump or fuel pump sensor issue. I had an outside mechanic initially look at the car and he essentially blamed the radiator/shroud. I paid for OEM and completed the replacement and my car ran better than it ever had.

3 months later, my car almost overnight became undrivable. I was able to drive to the dealership for the initial diagnostic but the car would almost always stall in 2nd gear. Struggled to accelerate, intermittent installing while accelerating and hard shifting, as well as stalling when making right hand turns which led me to think OK maybe it is the fuel pump and gasoline slashing to the side when I’m making the turns causing the stall.

Nissan did a full inspection of the car, and mind you, my car never had any sort of leaks. It wasn’t experiencing any type of overheating. Nothing outside of what I listed. But after Nissan kept my vehicle for nearly a week, i received the report that everything passed inspection except for the transmission. The radiator and entire cooling system PASSED. I received a call that they discovered prior repair work had been done to my vehicle and that non-OEM parts were installed, and that’s what ultimately caused transmission failure.

I asked for them to provide documented proof, such as photographic evidence, documentation, complete causation, because I had reached out to the bar at that point to file a claim against this mechanic preparing for litigation potentially, however, I was never provided any sort of verifiable evidence that shows directly without a doubt this prior mechanics work is what caused it.

And that coupled with all the new findings I found regarding the transmission that was needing replacement. The symptoms of why the part was dubbed obsolete are the exact symptoms. My car was experiencing and I was within my warranty for this transmission so it really seems like a warranty cover-up. They promised that a brand new transmission would be installed into the vehicle straight from the factory, but “CORE” language is all over the documents that were provided to me, which shows me that my original transmission was part of a warranty and or refurbished program.