2001 Jeep Wrangler that hates highways

Was the pan dropped and the filter changed when the transmission was flushed? Was the transmission cooler flushed and blown out separately when the transmission was flushed? I would also recommend having an independent transmission specialist check it out. The pump on Mopar transmissions have often failed from apparent foaming of fluid due to restricted coolers or cavitation from restricted filters. But I am not a transmission expert. I just serviced them and replaced them.