There is absolutely ZERO gain to this swap. It can't even be called an "upgrade". Just think how many years and how many cars have bushings in them. I can only surmise that Chrysler made the change to save money. Instead of reaming the hole to size and then pressing in a bushing, they could just hog out the crank and then tap a cheapo bearing into the existing flywheel register.
Obviously you don't know that this bearing fits in the machined index for the torque convertor. The gain is any crank can be used with a 4sp. Just check the depth of the pilot hole so it clears the input shaft.
