the 8 speed is the same trans thatvis going in the new 1500's its actually a fairly solid built tranny
Time will tell, I spent 9 years of my life at the Chrysler transmission plants, and was involved with several launches/retools.
Some things that I saw that were interesting
The 47RE was never able to make it past the dyno testing it usually made it about 3/4 of the way through the test.
The 48RE was able to make it through this test. It was a pretty grueling test, they had a V10 from an SRT10 ram. Full throttle until 55, then go to OD and half throttle, let it coast to a stop, then repeat. It was supposed to simulate a load of a pulling a travel trailer. I will say the engine was loaded, the exhaust was glowing to the floor.
The 42LE wouldn't hold up to the power of the 3.5L V6, so they had to pull the power back.
When they first put the hemi in front of the 545RFE it blew the trans on the first pass on the dyno.
Look at the 68RFE, sadly the engineering tools available today, allow the designers to shrink every part to the maximum amount, where in the olden days they just overbuilt things.
They will pull the low end power out of these to make the trans live.