What all parts besides the pumpkin did you have to change out? Axles, hubs, etc.? Any special tools needed?The automatic 8 speed has the open differential, the 8 speed auto transmission started in 2015, the manual transmission has the LSD differential.
I have a 2015 R/T Classic Plus 5.7L A8, it came with a 3.07 Open Differential, I swapped it out myself to a Mopar 3.09 Limited Slip Differential, using wheel ramps and jack stands. Note: Unless you have a high mechanical ability and a lot of common sense, I don't suggest doing it yourself, but it can be done.