Sorry accidentally deleted my prior post. So I regeared my 2010 jk 3.8 auto with 3.73s to 4.56s. Was told I did not need to program the pcm by the shop - a couple on here (sorry for the delete - lol) replies. Thank you. I’m still getting some saying it needs done and some saying if a model prior to 2012 there is no need to do so. I just don’t want to tear up my engine or trans due to rpms/shifting issues. I just got it back today from the shop and haven’t really had a chance to test it out fully yet. Anymore feedback is always welcome. anyone else on here have the regear done and yours is a older pre-2012 year? Thanks gang.