I know the subject of 68rfe vs Aisin comes up often. I don't have any experience with the 68rfe but I wanted to put my experience with the Aisin out there since I just bought a new 2024 3500 SRW with the Aisin and I regularly drive a 2022 3500 DRW and a 2018 3500 DRW, both with 4.10 gears, with the Aisin. The main complaint, if you want to call it that, with the Aisin is the slow and firm shifting when driving unloaded. Since my 24 is also my daily driver I was concerned about that, but I wanted the more robust transmission anyways and decided to live with it. I have certainly experienced the shifting issues with the 22 and 18 but this 24 is completely different. I'm not sure if gearing is part of the difference since the truck gains revs slower, but so far this truck shifts much smoother and there is less lag on the 1-2 shift than the older trucks. They have definitely changed the tuning between 22 and 24. You can certainly tell that it's a heavy-duty transmission and it doesn't shift like a Camry or anything, but it is perfectly fine for daily driving. I don't know how much this adds to the conversation about transmissions here, but I just wanted to put my experience out there and say that the Aisin has gotten better with each version I have driven.