Hey guys I have seen many questions over the last couple years about converting to LSD in the 15+ Chargers. I have the Road and Track package with 230mm axles. I just swapped out my open 3.07 to a 3.90 with no issues whatsoever. I didn't even need to reprogram the pcm, speed reads fine, no lights, etc. The Chrysler part # for the 3.90 is 5038703AG., I have a relationship w/ my dealer but purchased it for $730...... Just thought I'd throw this info out there!!