Newer auto transmissions are a lot better than the old slushy 727.
The 727 rebuilt with torrington thrust bearing and moder TC is better and runs much cooler (so less waste)
I went through a lot of this searching and then got a good deal on an 8HP70 from a newish wrecked RAM - the design wastes much less power with ingenious reduction in spinning gears etc.
My concerns were freeway rpm reduction for mpg and noise (3300 down to 2400), and better acceleration.

https://4wdlife.com/ram/8hp70-transmission
"through intelligent engineering, modern materials, and electronic management system, the overall fuel economy is improved by 11% over old ZF 6HP units and 14% over manual transmissions."