When I began the journey to pick a 1-ton truck, I began weighing the pros and cons of each manufacturer. The consistent issue between the big 3 was transmission reliability.
Ford: While the 6.7 Powerstroke is hell of an engine, the use of CP4 combined with the fact the TorqShift has been extremely problematic in the 2019+. Add to it the high instances of death wobble and the worst interiors of the bunch, Ford was out.
GM: The Silverado is extremely ugly to my eyes but the Sierra is pretty nice looking besides a couple quirks like the squarish wheels wheels and foot steps on the bedside. GM “Allison” has had a few issues as well (although significant less so than the Ford). the biggest thing that bugs me about the GM offerings is that they don’t paint their frames. I almost bought a 3500 AT4 but was shocked at the significant rusting I was seeing on the underside of brand new vehicles. I looked under a few friends trucks that were 3-5 years old and immediately crossed GM off the list.
Ram: The 68RFE has also had its fair share of documented problems but has seemed to see constant improvement. It’s weakness seems to be torque and while it can be bulletproofed for the right amount of money the Aisin has been generally regarded as the most bullet proof HD truck option; even if it has less civilized driving characteristics (which has seemed to have been improve drastically the last couple of years with programming/running updates).
Ultimately the Aisin transmission is the reason I opted for the HO. Knowing that the transmission is not a potential weak link is worth the small increase in cost. Bonus side is I get an engine that also comes with significant increases in performance. Win/win.