I’ve got a 2012 wrangler jku with 200k on her. On hot days she still drives great. When it gets cold the transmission slips between shifts until the fluid gets warm. Alternatively if you put it into sport mode it shifts fine, granted it shifts at higher RPM when you do this. Though I would think the higher RPM would cause more slip. The transmission has been serviced regularly and currently the fluid looks new and is at the correct level. Used transmissions for these things can set you back 2-3k from a recycler for a unit under 100k miles. What are your thoughts on what’s causing this behavior? My transmission knowledge isn’t the best though I can wrench. If it’s clutch packs or the bands that have worn out it’s out of my league. But if it’s a solenoid or two then I can do something like that, however I don’t want to throw money away just putting in parts.