tcc adjustment?
 

so i drove the gf's 05 mazda 3 after she was complain its driving funny and it shifts kinda fine up to 4th it kinda feels like its shifting slower than normal, and when decelerating once the revs drop below like 2k rpm or so then they just mke there way back down to idle even tho your still going like 35 -45. so that would indicated that the torque converter isnt locking up is there any kinda tests or adjustments i can do to fix this? cus there is no DTC's to point me in any direction