BTW...if you have a 2WD and an open rear diff, you WILL have traction issues (one -wheel-peel)
^this. My 4.7L has major traction issues with the higher stall converter. When it's raining I can't give it more than 1/8-1/4 pedal or I just sit still spinning. If I give it a pull pedal on dry pavement I burnt out a good distance. The hemis must have HUGE traction issues with open diff and a stall.
Most of these ~$500 converters will actually lose power in the upper rpms. The more expensive converters typically use a different stator that gets a higher stall rpm without sacrificing in the top end.
Install in the driveway is not all that hard, but requires a few things such as an extra set of hands, a transmission jack, patience. It's really an easy job but will take you most of the day your first time. After doing it 1 or 2 times it will only take you a couple hours(2wd).