are 47re autos weak?

The biggest thing that killed that transmission is the stupid check valve that Chrysler put in the cooler line. It's know to get clogged with crap and cook hard parts. That transmission will go until is smokes itself without the lube circuit from the cooler. First thing we always do when we have one in the shop is take that check valve out and installed a Transgo shift kit. It has a longer shoulder on the manual valve so the torque converter will not drain back when the vehicle sits for a few days. That was the only reason that check valve was added.