I need to replace my tranny cooler or at least the lines. Any advidce for a penny pinching DIYer? 1998 GC with 3.3 and 185K miles

dont cheap out with lines buy tranny line fuel lines dont handle temp and pressure the same use atf +3 or +4 if you cant find don not i repeat dont use dex merc 3 for cyrsler tranny hates it found out hard way autozone person said it is the same i beleived them put in limp mode 50 miles later not fun to get out of about 400 dollars went to autozone to complain manager said i am sorry person shouldnt have said that they have been replaced but didnt offer to pay damage done