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  1. Trans fluid - Big difference between Mopar and Synchromax / Royal Purple?

    Dodge Challenger Mechanical Problems and Questions
    I just had my transmission fluid changed after buying a used 2015 RT+ Shaker with about 31k miles on it. The transmission seems smoother now and the manual recommends only using Mopar fluid, but everybody raves about aftermarket fluid. Is there a noticeable difference in using these different...
  2. Have you upgraded your '15+ RT auto transmission?

    Challenger Performance Mods - Engine - 5.7L HEMI
    Hey, I want to upgrade my transmission but haven't seen anything for a '15 Challenger RT auto. I have a P-series ProCharger, forged internals, upgraded fuel injectors, long tube headers, Hellcat LSD and axles, 87mm throttle body. I'm getting about 515rwhp, shop told me that my tranny could only...
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